diff --git a/MANIFEST.in b/MANIFEST.in
index 85ec854..e2e7cd8 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,7 +1,7 @@
 include LICENSE
 include README.rst
 include cpuinfo.py
-include include/*.h
+include src/*.h
 include src/*.cc
 include src/*.cpp
 include src/*.pyx
diff --git a/README.rst b/README.rst
index 9d6d034..424c881 100644
--- a/README.rst
+++ b/README.rst
@@ -60,10 +60,12 @@ MetroHash algorithm. For stateless hashing, it exports ``metrohash64`` and
 Incremental hashing
 ~~~~~~~~~~~~~~~~~~~
 
-For incremental hashing, use ``MetroHash64`` and ``MetroHash128`` classes.
-Incremental hashing is associative and guarantees that any combination of input
-slices will result in the same final hash value. This is useful for processing
-large inputs and stream data. Example with two slices:
+Unlike its cousins CityHash and FarmHash, MetroHash allows incremental
+(stateful) hashing.  For incremental hashing, use ``MetroHash64`` and
+``MetroHash128`` classes.  Incremental hashing is associative and guarantees
+that any combination of input slices will result in the same final hash value.
+This is useful for processing large inputs and stream data. Example with two
+slices:
 
 .. code-block:: python
 
@@ -85,10 +87,14 @@ Note that the resulting hash value above is the same as in:
 Buffer protocol support
 ~~~~~~~~~~~~~~~~~~~~~~~
 
-The methods in this module support Python `Buffer Protocol
-<https://docs.python.org/3/c-api/buffer.html>`__, which allows them to be used
-on any object that exports a buffer interface. Here is an example showing
-hashing of a 4D NumPy array:
+The Python `Buffer Protocol <https://docs.python.org/3/c-api/buffer.html>`__
+allows Python objects to expose their data as raw byte arrays to other objects,
+for fast access without copying to a separate location in memory.  Among
+others, NumPy is a major framework that supports this protocol.
+
+All hashing functions in this packege will read byte arrays from objects that
+expose them via the buffer protocol. Here is an example showing hashing of a 4D
+NumPy array:
 
 .. code-block:: python
 
@@ -97,8 +103,8 @@ hashing of a 4D NumPy array:
     >>> metrohash.hash64_int(arr)
     12125832280816116063
 
-Note that arrays need to be contiguous for this to work. To convert a
-non-contiguous array, use ``np.ascontiguousarray()`` method.
+The arrays need to be contiguous for this to work. To convert a non-contiguous
+array, use NumPy's ``ascontiguousarray()`` function.
 
 Development
 -----------
diff --git a/cpp.mk b/cpp.mk
index 5f41131..f68fb50 100644
--- a/cpp.mk
+++ b/cpp.mk
@@ -2,7 +2,7 @@ CXX := g++
 CXXFLAGS := -std=c++11 -O3 -msse4.2
 LDFLAGS :=
 SRCEXT := cc
-INC := -I include
+INC := -I src
 LIB := -L lib
 
 INPUT := ./data/sample_100k.txt
diff --git a/pip-freeze.txt b/pip-freeze.txt
index e1c44b8..dfe6fa2 100644
--- a/pip-freeze.txt
+++ b/pip-freeze.txt
@@ -8,7 +8,7 @@ ipdb==0.13.9
 ipython==7.30.1
 jedi==0.18.1
 matplotlib-inline==0.1.3
--e git+https://github.com/escherba/python-metrohash@03ec8e4b0b21bf4a9726b3625d5ebc6e791b2a82#egg=metrohash
+-e git+https://github.com/escherba/python-metrohash@cffe9bc1c0b48c2269c9e0abe1fb564ccf86d41f#egg=metrohash
 numpy==1.21.5
 packaging==21.3
 parso==0.8.3
@@ -18,7 +18,7 @@ pluggy==1.0.0
 prompt-toolkit==3.0.24
 ptyprocess==0.7.0
 py==1.11.0
-Pygments==2.11.0
+Pygments==2.11.1
 pyparsing==3.0.6
 pytest==6.2.5
 toml==0.10.2
diff --git a/setup.py b/setup.py
index 4db8067..95b3a0d 100644
--- a/setup.py
+++ b/setup.py
@@ -31,7 +31,9 @@ def is_pure(self):
 
 CXXFLAGS = []
 
-print(f"building for platform: {os.name}")
+print("building for platform: %s" % os.name)
+print("available CPU flags: %s" % CPU_FLAGS)
+
 if os.name == "nt":
     CXXFLAGS.extend(["/O2"])
 else:
@@ -42,6 +44,13 @@ def is_pure(self):
     ])
 
 
+if 'ssse3' in CPU_FLAGS:
+    print("Compiling with SSSE3 enabled")
+    CXXFLAGS.append('-mssse3')
+else:
+    print("compiling without SSE3 support")
+
+
 if 'sse4_2' in CPU_FLAGS:
     print("Compiling with SSE4.2 enabled")
     CXXFLAGS.append('-msse4.2')
@@ -49,51 +58,44 @@ def is_pure(self):
     print("compiling without SSE4.2 support")
 
 
-INCLUDE_DIRS = ['include']
+INCLUDE_DIRS = ['src']
 CXXHEADERS = [
-    "include/metro.h",
-    "include/metrohash.h",
-    "include/metrohash128.h",
-    "include/metrohash128crc.h",
-    "include/metrohash64.h",
-    "include/platform.h",
+    "src/metro.h",
+    "src/metrohash.h",
+    "src/metrohash128.h",
+    "src/metrohash128crc.h",
+    "src/metrohash64.h",
+    "src/platform.h",
 ]
 CXXSOURCES = [
     "src/metrohash64.cc",
     "src/metrohash128.cc",
 ]
 
-CMDCLASS = {}
 EXT_MODULES = []
 
 if USE_CYTHON:
     print("building extension using Cython")
-    CMDCLASS['build_ext'] = build_ext
-    EXT_MODULES.append(
-        Extension(
-            "metrohash",
-            CXXSOURCES + ["src/metrohash.pyx"],
-            depends=CXXHEADERS,
-            language="c++",
-            extra_compile_args=CXXFLAGS,
-            include_dirs=INCLUDE_DIRS,
-        )
-    )
+    CMDCLASS = {'build_ext': build_ext}
+    SRC_EXT = ".pyx"
 else:
     print("building extension w/o Cython")
-    EXT_MODULES.append(
-        Extension(
-            "metrohash",
-            CXXSOURCES + ["src/metrohash.cpp"],
-            depends=CXXHEADERS,
-            language="c++",
-            extra_compile_args=CXXFLAGS,
-            include_dirs=INCLUDE_DIRS,
-        )
-    )
-
-
-VERSION = '0.1.1.post2'
+    CMDCLASS = {}
+    SRC_EXT = ".cpp"
+
+
+EXT_MODULES = [
+    Extension(
+        "metrohash",
+        CXXSOURCES + ["src/metrohash" + SRC_EXT],
+        depends=CXXHEADERS,
+        language="c++",
+        extra_compile_args=CXXFLAGS,
+        include_dirs=INCLUDE_DIRS,
+    ),
+]
+
+VERSION = '0.1.1.post3'
 URL = "https://github.com/escherba/python-metrohash"
 
 
diff --git a/include/metro.h b/src/metro.h
similarity index 100%
rename from include/metro.h
rename to src/metro.h
diff --git a/src/metrohash.cpp b/src/metrohash.cpp
index ee3c2de..537055a 100644
--- a/src/metrohash.cpp
+++ b/src/metrohash.cpp
@@ -917,7 +917,7 @@ struct __pyx_obj_9metrohash_MetroHash128;
 struct __pyx_opt_args_9metrohash_hash64;
 struct __pyx_opt_args_9metrohash_hash128;
 
-/* "metrohash.pyx":98
+/* "metrohash.pyx":100
  * 
  * 
  * cpdef bytes hash64(data, uint64_t seed=0ULL):             # <<<<<<<<<<<<<<
@@ -929,7 +929,7 @@ struct __pyx_opt_args_9metrohash_hash64 {
   uint64_t seed;
 };
 
-/* "metrohash.pyx":131
+/* "metrohash.pyx":133
  * 
  * 
  * cpdef bytes hash128(data, uint64_t seed=0ULL):             # <<<<<<<<<<<<<<
@@ -941,7 +941,7 @@ struct __pyx_opt_args_9metrohash_hash128 {
   uint64_t seed;
 };
 
-/* "metrohash.pyx":258
+/* "metrohash.pyx":261
  * 
  * 
  * cdef class MetroHash64(object):             # <<<<<<<<<<<<<<
@@ -955,7 +955,7 @@ struct __pyx_obj_9metrohash_MetroHash64 {
 };
 
 
-/* "metrohash.pyx":342
+/* "metrohash.pyx":345
  * 
  * 
  * cdef class MetroHash128(object):             # <<<<<<<<<<<<<<
@@ -970,7 +970,7 @@ struct __pyx_obj_9metrohash_MetroHash128 {
 
 
 
-/* "metrohash.pyx":258
+/* "metrohash.pyx":261
  * 
  * 
  * cdef class MetroHash64(object):             # <<<<<<<<<<<<<<
@@ -984,7 +984,7 @@ struct __pyx_vtabstruct_9metrohash_MetroHash64 {
 static struct __pyx_vtabstruct_9metrohash_MetroHash64 *__pyx_vtabptr_9metrohash_MetroHash64;
 
 
-/* "metrohash.pyx":342
+/* "metrohash.pyx":345
  * 
  * 
  * cdef class MetroHash128(object):             # <<<<<<<<<<<<<<
@@ -1508,7 +1508,7 @@ static const char __pyx_k_basestring[] = "basestring";
 static const char __pyx_k_hash64_hex[] = "hash64_hex";
 static const char __pyx_k_hash64_int[] = "hash64_int";
 static const char __pyx_k_pyx_vtable[] = "__pyx_vtable__";
-static const char __pyx_k_0_1_1_post2[] = "0.1.1.post2";
+static const char __pyx_k_0_1_1_post3[] = "0.1.1.post3";
 static const char __pyx_k_MemoryError[] = "MemoryError";
 static const char __pyx_k_MetroHash64[] = "MetroHash64";
 static const char __pyx_k_hash128_hex[] = "hash128_hex";
@@ -1526,7 +1526,7 @@ static const char __pyx_k_escherba_metrohash_gmail_com[] = "escherba+metrohash@g
 static const char __pyx_k_Python_wrapper_for_MetroHash_a[] = "\nPython wrapper for MetroHash, a fast non-cryptographic hashing algorithm\n";
 static const char __pyx_k_Argument_s_has_incorrect_type_ex[] = "Argument '%s' has incorrect type: expected %s, got '%s' instead";
 static const char __pyx_k_no_default___reduce___due_to_non[] = "no default __reduce__ due to non-trivial __cinit__";
-static PyObject *__pyx_kp_s_0_1_1_post2;
+static PyObject *__pyx_kp_s_0_1_1_post3;
 static PyObject *__pyx_kp_s_Argument_s_has_incorrect_type_ex;
 static PyObject *__pyx_kp_s_Eugene_Scherba;
 static PyObject *__pyx_n_s_MemoryError;
@@ -1628,7 +1628,7 @@ static PyObject *__pyx_codeobj__17;
 static PyObject *__pyx_codeobj__19;
 /* Late includes */
 
-/* "metrohash.pyx":84
+/* "metrohash.pyx":86
  * 
  * if sys.version_info < (3, ):
  *     def bytes2hex(bs: bytes) -> str:             # <<<<<<<<<<<<<<
@@ -1647,7 +1647,7 @@ static PyObject *__pyx_pw_9metrohash_1bytes2hex(PyObject *__pyx_self, PyObject *
   PyObject *__pyx_r = 0;
   __Pyx_RefNannyDeclarations
   __Pyx_RefNannySetupContext("bytes2hex (wrapper)", 0);
-  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_bs), (&PyBytes_Type), 1, "bs", 1))) __PYX_ERR(0, 84, __pyx_L1_error)
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_bs), (&PyBytes_Type), 1, "bs", 1))) __PYX_ERR(0, 86, __pyx_L1_error)
   __pyx_r = __pyx_pf_9metrohash_bytes2hex(__pyx_self, ((PyObject*)__pyx_v_bs));
 
   /* function exit code */
@@ -1668,7 +1668,7 @@ static PyObject *__pyx_pf_9metrohash_bytes2hex(CYTHON_UNUSED PyObject *__pyx_sel
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("bytes2hex", 0);
 
-  /* "metrohash.pyx":85
+  /* "metrohash.pyx":87
  * if sys.version_info < (3, ):
  *     def bytes2hex(bs: bytes) -> str:
  *         return bs.encode("hex")             # <<<<<<<<<<<<<<
@@ -1676,14 +1676,14 @@ static PyObject *__pyx_pf_9metrohash_bytes2hex(CYTHON_UNUSED PyObject *__pyx_sel
  *     def bytes2hex(bs: bytes) -> str:
  */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_1 = __Pyx_CallUnboundCMethod1(&__pyx_umethod_PyBytes_Type_encode, __pyx_v_bs, __pyx_n_s_hex); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 85, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_CallUnboundCMethod1(&__pyx_umethod_PyBytes_Type_encode, __pyx_v_bs, __pyx_n_s_hex); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 87, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
-  if (!(likely(PyString_CheckExact(__pyx_t_1))||((__pyx_t_1) == Py_None)||(PyErr_Format(PyExc_TypeError, "Expected %.16s, got %.200s", "str", Py_TYPE(__pyx_t_1)->tp_name), 0))) __PYX_ERR(0, 85, __pyx_L1_error)
+  if (!(likely(PyString_CheckExact(__pyx_t_1))||((__pyx_t_1) == Py_None)||(PyErr_Format(PyExc_TypeError, "Expected %.16s, got %.200s", "str", Py_TYPE(__pyx_t_1)->tp_name), 0))) __PYX_ERR(0, 87, __pyx_L1_error)
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   __pyx_t_1 = 0;
   goto __pyx_L0;
 
-  /* "metrohash.pyx":84
+  /* "metrohash.pyx":86
  * 
  * if sys.version_info < (3, ):
  *     def bytes2hex(bs: bytes) -> str:             # <<<<<<<<<<<<<<
@@ -1702,7 +1702,7 @@ static PyObject *__pyx_pf_9metrohash_bytes2hex(CYTHON_UNUSED PyObject *__pyx_sel
   return __pyx_r;
 }
 
-/* "metrohash.pyx":87
+/* "metrohash.pyx":89
  *         return bs.encode("hex")
  * else:
  *     def bytes2hex(bs: bytes) -> str:             # <<<<<<<<<<<<<<
@@ -1721,7 +1721,7 @@ static PyObject *__pyx_pw_9metrohash_3bytes2hex(PyObject *__pyx_self, PyObject *
   PyObject *__pyx_r = 0;
   __Pyx_RefNannyDeclarations
   __Pyx_RefNannySetupContext("bytes2hex (wrapper)", 0);
-  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_bs), (&PyBytes_Type), 1, "bs", 1))) __PYX_ERR(0, 87, __pyx_L1_error)
+  if (unlikely(!__Pyx_ArgTypeTest(((PyObject *)__pyx_v_bs), (&PyBytes_Type), 1, "bs", 1))) __PYX_ERR(0, 89, __pyx_L1_error)
   __pyx_r = __pyx_pf_9metrohash_2bytes2hex(__pyx_self, ((PyObject*)__pyx_v_bs));
 
   /* function exit code */
@@ -1742,7 +1742,7 @@ static PyObject *__pyx_pf_9metrohash_2bytes2hex(CYTHON_UNUSED PyObject *__pyx_se
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("bytes2hex", 0);
 
-  /* "metrohash.pyx":88
+  /* "metrohash.pyx":90
  * else:
  *     def bytes2hex(bs: bytes) -> str:
  *         return bs.hex()             # <<<<<<<<<<<<<<
@@ -1750,14 +1750,14 @@ static PyObject *__pyx_pf_9metrohash_2bytes2hex(CYTHON_UNUSED PyObject *__pyx_se
  * 
  */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_1 = __Pyx_CallUnboundCMethod0(&__pyx_umethod_PyBytes_Type_hex, __pyx_v_bs); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 88, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_CallUnboundCMethod0(&__pyx_umethod_PyBytes_Type_hex, __pyx_v_bs); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 90, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
-  if (!(likely(PyString_CheckExact(__pyx_t_1))||((__pyx_t_1) == Py_None)||(PyErr_Format(PyExc_TypeError, "Expected %.16s, got %.200s", "str", Py_TYPE(__pyx_t_1)->tp_name), 0))) __PYX_ERR(0, 88, __pyx_L1_error)
+  if (!(likely(PyString_CheckExact(__pyx_t_1))||((__pyx_t_1) == Py_None)||(PyErr_Format(PyExc_TypeError, "Expected %.16s, got %.200s", "str", Py_TYPE(__pyx_t_1)->tp_name), 0))) __PYX_ERR(0, 90, __pyx_L1_error)
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   __pyx_t_1 = 0;
   goto __pyx_L0;
 
-  /* "metrohash.pyx":87
+  /* "metrohash.pyx":89
  *         return bs.encode("hex")
  * else:
  *     def bytes2hex(bs: bytes) -> str:             # <<<<<<<<<<<<<<
@@ -1776,7 +1776,7 @@ static PyObject *__pyx_pf_9metrohash_2bytes2hex(CYTHON_UNUSED PyObject *__pyx_se
   return __pyx_r;
 }
 
-/* "metrohash.pyx":91
+/* "metrohash.pyx":93
  * 
  * 
  * cdef object _type_error(argname: str, expected: object, value: object):             # <<<<<<<<<<<<<<
@@ -1794,7 +1794,7 @@ static PyObject *__pyx_f_9metrohash__type_error(PyObject *__pyx_v_argname, PyObj
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("_type_error", 0);
 
-  /* "metrohash.pyx":92
+  /* "metrohash.pyx":94
  * 
  * cdef object _type_error(argname: str, expected: object, value: object):
  *     return TypeError(             # <<<<<<<<<<<<<<
@@ -1803,16 +1803,16 @@ static PyObject *__pyx_f_9metrohash__type_error(PyObject *__pyx_v_argname, PyObj
  */
   __Pyx_XDECREF(__pyx_r);
 
-  /* "metrohash.pyx":94
+  /* "metrohash.pyx":96
  *     return TypeError(
  *         "Argument '%s' has incorrect type: expected %s, got '%s' instead" %
  *         (argname, expected, type(value).__name__)             # <<<<<<<<<<<<<<
  *     )
  * 
  */
-  __pyx_t_1 = __Pyx_PyObject_GetAttrStr(((PyObject *)Py_TYPE(__pyx_v_value)), __pyx_n_s_name); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 94, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyObject_GetAttrStr(((PyObject *)Py_TYPE(__pyx_v_value)), __pyx_n_s_name); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 96, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
-  __pyx_t_2 = PyTuple_New(3); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 94, __pyx_L1_error)
+  __pyx_t_2 = PyTuple_New(3); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 96, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_2);
   __Pyx_INCREF(__pyx_v_argname);
   __Pyx_GIVEREF(__pyx_v_argname);
@@ -1824,32 +1824,32 @@ static PyObject *__pyx_f_9metrohash__type_error(PyObject *__pyx_v_argname, PyObj
   PyTuple_SET_ITEM(__pyx_t_2, 2, __pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "metrohash.pyx":93
+  /* "metrohash.pyx":95
  * cdef object _type_error(argname: str, expected: object, value: object):
  *     return TypeError(
  *         "Argument '%s' has incorrect type: expected %s, got '%s' instead" %             # <<<<<<<<<<<<<<
  *         (argname, expected, type(value).__name__)
  *     )
  */
-  __pyx_t_1 = __Pyx_PyString_Format(__pyx_kp_s_Argument_s_has_incorrect_type_ex, __pyx_t_2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 93, __pyx_L1_error)
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   __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
 
-  /* "metrohash.pyx":92
+  /* "metrohash.pyx":94
  * 
  * cdef object _type_error(argname: str, expected: object, value: object):
  *     return TypeError(             # <<<<<<<<<<<<<<
  *         "Argument '%s' has incorrect type: expected %s, got '%s' instead" %
  *         (argname, expected, type(value).__name__)
  */
-  __pyx_t_2 = __Pyx_PyObject_CallOneArg(__pyx_builtin_TypeError, __pyx_t_1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 92, __pyx_L1_error)
+  __pyx_t_2 = __Pyx_PyObject_CallOneArg(__pyx_builtin_TypeError, __pyx_t_1); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 94, __pyx_L1_error)
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   __pyx_t_2 = 0;
   goto __pyx_L0;
 
-  /* "metrohash.pyx":91
+  /* "metrohash.pyx":93
  * 
  * 
  * cdef object _type_error(argname: str, expected: object, value: object):             # <<<<<<<<<<<<<<
@@ -1869,7 +1869,7 @@ static PyObject *__pyx_f_9metrohash__type_error(PyObject *__pyx_v_argname, PyObj
   return __pyx_r;
 }
 
-/* "metrohash.pyx":98
+/* "metrohash.pyx":100
  * 
  * 
  * cpdef bytes hash64(data, uint64_t seed=0ULL):             # <<<<<<<<<<<<<<
@@ -1900,19 +1900,19 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
     }
   }
 
-  /* "metrohash.pyx":112
+  /* "metrohash.pyx":114
  *     cdef Py_buffer buf
  *     cdef bytes obj
  *     cdef bytearray out = bytearray(8)             # <<<<<<<<<<<<<<
  *     if PyUnicode_Check(data):
  *         obj = PyUnicode_AsUTF8String(data)
  */
-  __pyx_t_1 = __Pyx_PyObject_Call(((PyObject *)(&PyByteArray_Type)), __pyx_tuple_, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 112, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyObject_Call(((PyObject *)(&PyByteArray_Type)), __pyx_tuple_, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 114, __pyx_L1_error)
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   __pyx_v_out = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "metrohash.pyx":113
+  /* "metrohash.pyx":115
  *     cdef bytes obj
  *     cdef bytearray out = bytearray(8)
  *     if PyUnicode_Check(data):             # <<<<<<<<<<<<<<
@@ -1922,38 +1922,38 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
   __pyx_t_2 = (PyUnicode_Check(__pyx_v_data) != 0);
   if (__pyx_t_2) {
 
-    /* "metrohash.pyx":114
+    /* "metrohash.pyx":116
  *     cdef bytearray out = bytearray(8)
  *     if PyUnicode_Check(data):
  *         obj = PyUnicode_AsUTF8String(data)             # <<<<<<<<<<<<<<
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         CCMetroHash64.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  */
-    __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_v_data); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 114, __pyx_L1_error)
+    __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_v_data); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 116, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
     __pyx_v_obj = ((PyObject*)__pyx_t_1);
     __pyx_t_1 = 0;
 
-    /* "metrohash.pyx":115
+    /* "metrohash.pyx":117
  *     if PyUnicode_Check(data):
  *         obj = PyUnicode_AsUTF8String(data)
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)             # <<<<<<<<<<<<<<
  *         CCMetroHash64.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  *         PyBuffer_Release(&buf)
  */
-    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_obj, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 115, __pyx_L1_error)
+    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_obj, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 117, __pyx_L1_error)
 
-    /* "metrohash.pyx":116
+    /* "metrohash.pyx":118
  *         obj = PyUnicode_AsUTF8String(data)
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         CCMetroHash64.Hash(<const uint8 *>buf.buf, buf.len, out, seed)             # <<<<<<<<<<<<<<
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):
  */
-    __pyx_t_4 = __Pyx_PyObject_AsWritableUString(__pyx_v_out); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 116, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_PyObject_AsWritableUString(__pyx_v_out); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 118, __pyx_L1_error)
     MetroHash64::Hash(((uint8 const *)__pyx_v_buf.buf), __pyx_v_buf.len, __pyx_t_4, __pyx_v_seed);
 
-    /* "metrohash.pyx":117
+    /* "metrohash.pyx":119
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         CCMetroHash64.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  *         PyBuffer_Release(&buf)             # <<<<<<<<<<<<<<
@@ -1962,7 +1962,7 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
  */
     PyBuffer_Release((&__pyx_v_buf));
 
-    /* "metrohash.pyx":113
+    /* "metrohash.pyx":115
  *     cdef bytes obj
  *     cdef bytearray out = bytearray(8)
  *     if PyUnicode_Check(data):             # <<<<<<<<<<<<<<
@@ -1972,7 +1972,7 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
     goto __pyx_L3;
   }
 
-  /* "metrohash.pyx":118
+  /* "metrohash.pyx":120
  *         CCMetroHash64.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):             # <<<<<<<<<<<<<<
@@ -1982,16 +1982,16 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
   __pyx_t_2 = (PyBytes_Check(__pyx_v_data) != 0);
   if (__pyx_t_2) {
 
-    /* "metrohash.pyx":121
+    /* "metrohash.pyx":123
  *         CCMetroHash64.Hash(
  *             <const uint8 *>PyBytes_AS_STRING(data),
  *             PyBytes_GET_SIZE(data), out, seed)             # <<<<<<<<<<<<<<
  *     elif PyObject_CheckBuffer(data):
  *         PyObject_GetBuffer(data, &buf, PyBUF_SIMPLE)
  */
-    __pyx_t_4 = __Pyx_PyObject_AsWritableUString(__pyx_v_out); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 121, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_PyObject_AsWritableUString(__pyx_v_out); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 123, __pyx_L1_error)
 
-    /* "metrohash.pyx":119
+    /* "metrohash.pyx":121
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):
  *         CCMetroHash64.Hash(             # <<<<<<<<<<<<<<
@@ -2000,7 +2000,7 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
  */
     MetroHash64::Hash(((uint8 const *)PyBytes_AS_STRING(__pyx_v_data)), PyBytes_GET_SIZE(__pyx_v_data), __pyx_t_4, __pyx_v_seed);
 
-    /* "metrohash.pyx":118
+    /* "metrohash.pyx":120
  *         CCMetroHash64.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):             # <<<<<<<<<<<<<<
@@ -2010,7 +2010,7 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
     goto __pyx_L3;
   }
 
-  /* "metrohash.pyx":122
+  /* "metrohash.pyx":124
  *             <const uint8 *>PyBytes_AS_STRING(data),
  *             PyBytes_GET_SIZE(data), out, seed)
  *     elif PyObject_CheckBuffer(data):             # <<<<<<<<<<<<<<
@@ -2020,26 +2020,26 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
   __pyx_t_2 = (PyObject_CheckBuffer(__pyx_v_data) != 0);
   if (likely(__pyx_t_2)) {
 
-    /* "metrohash.pyx":123
+    /* "metrohash.pyx":125
  *             PyBytes_GET_SIZE(data), out, seed)
  *     elif PyObject_CheckBuffer(data):
  *         PyObject_GetBuffer(data, &buf, PyBUF_SIMPLE)             # <<<<<<<<<<<<<<
  *         CCMetroHash64.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  *         PyBuffer_Release(&buf)
  */
-    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_data, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 123, __pyx_L1_error)
+    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_data, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 125, __pyx_L1_error)
 
-    /* "metrohash.pyx":124
+    /* "metrohash.pyx":126
  *     elif PyObject_CheckBuffer(data):
  *         PyObject_GetBuffer(data, &buf, PyBUF_SIMPLE)
  *         CCMetroHash64.Hash(<const uint8 *>buf.buf, buf.len, out, seed)             # <<<<<<<<<<<<<<
  *         PyBuffer_Release(&buf)
  *     else:
  */
-    __pyx_t_4 = __Pyx_PyObject_AsWritableUString(__pyx_v_out); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 124, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_PyObject_AsWritableUString(__pyx_v_out); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 126, __pyx_L1_error)
     MetroHash64::Hash(((uint8 const *)__pyx_v_buf.buf), __pyx_v_buf.len, __pyx_t_4, __pyx_v_seed);
 
-    /* "metrohash.pyx":125
+    /* "metrohash.pyx":127
  *         PyObject_GetBuffer(data, &buf, PyBUF_SIMPLE)
  *         CCMetroHash64.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  *         PyBuffer_Release(&buf)             # <<<<<<<<<<<<<<
@@ -2048,7 +2048,7 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
  */
     PyBuffer_Release((&__pyx_v_buf));
 
-    /* "metrohash.pyx":122
+    /* "metrohash.pyx":124
  *             <const uint8 *>PyBytes_AS_STRING(data),
  *             PyBytes_GET_SIZE(data), out, seed)
  *     elif PyObject_CheckBuffer(data):             # <<<<<<<<<<<<<<
@@ -2058,7 +2058,7 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
     goto __pyx_L3;
   }
 
-  /* "metrohash.pyx":127
+  /* "metrohash.pyx":129
  *         PyBuffer_Release(&buf)
  *     else:
  *         raise _type_error("data", ["basestring", "buffer"], data)             # <<<<<<<<<<<<<<
@@ -2066,7 +2066,7 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
  * 
  */
   /*else*/ {
-    __pyx_t_1 = PyList_New(2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 127, __pyx_L1_error)
+    __pyx_t_1 = PyList_New(2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 129, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
     __Pyx_INCREF(__pyx_n_s_basestring);
     __Pyx_GIVEREF(__pyx_n_s_basestring);
@@ -2074,16 +2074,16 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
     __Pyx_INCREF(__pyx_n_s_buffer);
     __Pyx_GIVEREF(__pyx_n_s_buffer);
     PyList_SET_ITEM(__pyx_t_1, 1, __pyx_n_s_buffer);
-    __pyx_t_5 = __pyx_f_9metrohash__type_error(__pyx_n_s_data, __pyx_t_1, __pyx_v_data); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 127, __pyx_L1_error)
+    __pyx_t_5 = __pyx_f_9metrohash__type_error(__pyx_n_s_data, __pyx_t_1, __pyx_v_data); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 129, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_5);
     __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
     __Pyx_Raise(__pyx_t_5, 0, 0, 0);
     __Pyx_DECREF(__pyx_t_5); __pyx_t_5 = 0;
-    __PYX_ERR(0, 127, __pyx_L1_error)
+    __PYX_ERR(0, 129, __pyx_L1_error)
   }
   __pyx_L3:;
 
-  /* "metrohash.pyx":128
+  /* "metrohash.pyx":130
  *     else:
  *         raise _type_error("data", ["basestring", "buffer"], data)
  *     return bytes(out)             # <<<<<<<<<<<<<<
@@ -2091,13 +2091,13 @@ static PyObject *__pyx_f_9metrohash_hash64(PyObject *__pyx_v_data, CYTHON_UNUSED
  * 
  */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_5 = __Pyx_PyObject_CallOneArg(((PyObject *)(&PyBytes_Type)), __pyx_v_out); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 128, __pyx_L1_error)
+  __pyx_t_5 = __Pyx_PyObject_CallOneArg(((PyObject *)(&PyBytes_Type)), __pyx_v_out); if (unlikely(!__pyx_t_5)) __PYX_ERR(0, 130, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_5);
   __pyx_r = ((PyObject*)__pyx_t_5);
   __pyx_t_5 = 0;
   goto __pyx_L0;
 
-  /* "metrohash.pyx":98
+  /* "metrohash.pyx":100
  * 
  * 
  * cpdef bytes hash64(data, uint64_t seed=0ULL):             # <<<<<<<<<<<<<<
@@ -2158,7 +2158,7 @@ static PyObject *__pyx_pw_9metrohash_5hash64(PyObject *__pyx_self, PyObject *__p
         }
       }
       if (unlikely(kw_args > 0)) {
-        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "hash64") < 0)) __PYX_ERR(0, 98, __pyx_L3_error)
+        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "hash64") < 0)) __PYX_ERR(0, 100, __pyx_L3_error)
       }
     } else {
       switch (PyTuple_GET_SIZE(__pyx_args)) {
@@ -2171,14 +2171,14 @@ static PyObject *__pyx_pw_9metrohash_5hash64(PyObject *__pyx_self, PyObject *__p
     }
     __pyx_v_data = values[0];
     if (values[1]) {
-      __pyx_v_seed = __Pyx_PyInt_As_uint64_t(values[1]); if (unlikely((__pyx_v_seed == ((uint64_t)-1)) && PyErr_Occurred())) __PYX_ERR(0, 98, __pyx_L3_error)
+      __pyx_v_seed = __Pyx_PyInt_As_uint64_t(values[1]); if (unlikely((__pyx_v_seed == ((uint64_t)-1)) && PyErr_Occurred())) __PYX_ERR(0, 100, __pyx_L3_error)
     } else {
       __pyx_v_seed = ((uint64_t)0ULL);
     }
   }
   goto __pyx_L4_argument_unpacking_done;
   __pyx_L5_argtuple_error:;
-  __Pyx_RaiseArgtupleInvalid("hash64", 0, 1, 2, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 98, __pyx_L3_error)
+  __Pyx_RaiseArgtupleInvalid("hash64", 0, 1, 2, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 100, __pyx_L3_error)
   __pyx_L3_error:;
   __Pyx_AddTraceback("metrohash.hash64", __pyx_clineno, __pyx_lineno, __pyx_filename);
   __Pyx_RefNannyFinishContext();
@@ -2203,7 +2203,7 @@ static PyObject *__pyx_pf_9metrohash_4hash64(CYTHON_UNUSED PyObject *__pyx_self,
   __Pyx_XDECREF(__pyx_r);
   __pyx_t_2.__pyx_n = 1;
   __pyx_t_2.seed = __pyx_v_seed;
-  __pyx_t_1 = __pyx_f_9metrohash_hash64(__pyx_v_data, 0, &__pyx_t_2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 98, __pyx_L1_error)
+  __pyx_t_1 = __pyx_f_9metrohash_hash64(__pyx_v_data, 0, &__pyx_t_2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 100, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_r = __pyx_t_1;
   __pyx_t_1 = 0;
@@ -2220,7 +2220,7 @@ static PyObject *__pyx_pf_9metrohash_4hash64(CYTHON_UNUSED PyObject *__pyx_self,
   return __pyx_r;
 }
 
-/* "metrohash.pyx":131
+/* "metrohash.pyx":133
  * 
  * 
  * cpdef bytes hash128(data, uint64_t seed=0ULL):             # <<<<<<<<<<<<<<
@@ -2251,19 +2251,19 @@ static PyObject *__pyx_f_9metrohash_hash128(PyObject *__pyx_v_data, CYTHON_UNUSE
     }
   }
 
-  /* "metrohash.pyx":145
+  /* "metrohash.pyx":147
  *     cdef Py_buffer buf
  *     cdef bytes obj
  *     cdef bytearray out = bytearray(16)             # <<<<<<<<<<<<<<
  *     if PyUnicode_Check(data):
  *         obj = PyUnicode_AsUTF8String(data)
  */
-  __pyx_t_1 = __Pyx_PyObject_Call(((PyObject *)(&PyByteArray_Type)), __pyx_tuple__2, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 145, __pyx_L1_error)
+  __pyx_t_1 = __Pyx_PyObject_Call(((PyObject *)(&PyByteArray_Type)), __pyx_tuple__2, NULL); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 147, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
   __pyx_v_out = ((PyObject*)__pyx_t_1);
   __pyx_t_1 = 0;
 
-  /* "metrohash.pyx":146
+  /* "metrohash.pyx":148
  *     cdef bytes obj
  *     cdef bytearray out = bytearray(16)
  *     if PyUnicode_Check(data):             # <<<<<<<<<<<<<<
@@ -2273,38 +2273,38 @@ static PyObject *__pyx_f_9metrohash_hash128(PyObject *__pyx_v_data, CYTHON_UNUSE
   __pyx_t_2 = (PyUnicode_Check(__pyx_v_data) != 0);
   if (__pyx_t_2) {
 
-    /* "metrohash.pyx":147
+    /* "metrohash.pyx":149
  *     cdef bytearray out = bytearray(16)
  *     if PyUnicode_Check(data):
  *         obj = PyUnicode_AsUTF8String(data)             # <<<<<<<<<<<<<<
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         CCMetroHash128.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  */
-    __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_v_data); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 147, __pyx_L1_error)
+    __pyx_t_1 = PyUnicode_AsUTF8String(__pyx_v_data); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 149, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_1);
     __pyx_v_obj = ((PyObject*)__pyx_t_1);
     __pyx_t_1 = 0;
 
-    /* "metrohash.pyx":148
+    /* "metrohash.pyx":150
  *     if PyUnicode_Check(data):
  *         obj = PyUnicode_AsUTF8String(data)
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)             # <<<<<<<<<<<<<<
  *         CCMetroHash128.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  *         PyBuffer_Release(&buf)
  */
-    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_obj, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 148, __pyx_L1_error)
+    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_obj, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 150, __pyx_L1_error)
 
-    /* "metrohash.pyx":149
+    /* "metrohash.pyx":151
  *         obj = PyUnicode_AsUTF8String(data)
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         CCMetroHash128.Hash(<const uint8 *>buf.buf, buf.len, out, seed)             # <<<<<<<<<<<<<<
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):
  */
-    __pyx_t_4 = __Pyx_PyObject_AsWritableUString(__pyx_v_out); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 149, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_PyObject_AsWritableUString(__pyx_v_out); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 151, __pyx_L1_error)
     MetroHash128::Hash(((uint8 const *)__pyx_v_buf.buf), __pyx_v_buf.len, __pyx_t_4, __pyx_v_seed);
 
-    /* "metrohash.pyx":150
+    /* "metrohash.pyx":152
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         CCMetroHash128.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  *         PyBuffer_Release(&buf)             # <<<<<<<<<<<<<<
@@ -2313,7 +2313,7 @@ static PyObject *__pyx_f_9metrohash_hash128(PyObject *__pyx_v_data, CYTHON_UNUSE
  */
     PyBuffer_Release((&__pyx_v_buf));
 
-    /* "metrohash.pyx":146
+    /* "metrohash.pyx":148
  *     cdef bytes obj
  *     cdef bytearray out = bytearray(16)
  *     if PyUnicode_Check(data):             # <<<<<<<<<<<<<<
@@ -2323,7 +2323,7 @@ static PyObject *__pyx_f_9metrohash_hash128(PyObject *__pyx_v_data, CYTHON_UNUSE
     goto __pyx_L3;
   }
 
-  /* "metrohash.pyx":151
+  /* "metrohash.pyx":153
  *         CCMetroHash128.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):             # <<<<<<<<<<<<<<
@@ -2333,16 +2333,16 @@ static PyObject *__pyx_f_9metrohash_hash128(PyObject *__pyx_v_data, CYTHON_UNUSE
   __pyx_t_2 = (PyBytes_Check(__pyx_v_data) != 0);
   if (__pyx_t_2) {
 
-    /* "metrohash.pyx":154
+    /* "metrohash.pyx":156
  *         CCMetroHash128.Hash(
  *             <const uint8 *>PyBytes_AS_STRING(data),
  *             PyBytes_GET_SIZE(data), out, seed)             # <<<<<<<<<<<<<<
  *     elif PyObject_CheckBuffer(data):
  *         PyObject_GetBuffer(data, &buf, PyBUF_SIMPLE)
  */
-    __pyx_t_4 = __Pyx_PyObject_AsWritableUString(__pyx_v_out); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 154, __pyx_L1_error)
+    __pyx_t_4 = __Pyx_PyObject_AsWritableUString(__pyx_v_out); if (unlikely((!__pyx_t_4) && PyErr_Occurred())) __PYX_ERR(0, 156, __pyx_L1_error)
 
-    /* "metrohash.pyx":152
+    /* "metrohash.pyx":154
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):
  *         CCMetroHash128.Hash(             # <<<<<<<<<<<<<<
@@ -2351,7 +2351,7 @@ static PyObject *__pyx_f_9metrohash_hash128(PyObject *__pyx_v_data, CYTHON_UNUSE
  */
     MetroHash128::Hash(((uint8 const *)PyBytes_AS_STRING(__pyx_v_data)), PyBytes_GET_SIZE(__pyx_v_data), __pyx_t_4, __pyx_v_seed);
 
-    /* "metrohash.pyx":151
+    /* "metrohash.pyx":153
  *         CCMetroHash128.Hash(<const uint8 *>buf.buf, buf.len, out, seed)
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):             # <<<<<<<<<<<<<<
@@ -2361,7 +2361,7 @@ static PyObject *__pyx_f_9metrohash_hash128(PyObject *__pyx_v_data, CYTHON_UNUSE
     goto __pyx_L3;
   }
 
-  /* "metrohash.pyx":155
+  /* "metrohash.pyx":157
  *             <const uint8 *>PyBytes_AS_STRING(data),
  *             PyBytes_GET_SIZE(data), out, seed)
  *     elif PyObject_CheckBuffer(data):             # <<<<<<<<<<<<<<
@@ -2371,26 +2371,26 @@ static PyObject *__pyx_f_9metrohash_hash128(PyObject *__pyx_v_data, CYTHON_UNUSE
   __pyx_t_2 = (PyObject_CheckBuffer(__pyx_v_data) != 0);
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-    /* "metrohash.pyx":156
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-    /* "metrohash.pyx":157
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-    /* "metrohash.pyx":158
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-    /* "metrohash.pyx":155
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-  /* "metrohash.pyx":160
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-  /* "metrohash.pyx":161
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@@ -2442,13 +2442,13 @@ static PyObject *__pyx_f_9metrohash_hash128(PyObject *__pyx_v_data, CYTHON_UNUSE
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-  /* "metrohash.pyx":131
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+  __pyx_t_1 = __pyx_f_9metrohash_hash128(__pyx_v_data, 0, &__pyx_t_2); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 133, __pyx_L1_error)
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-/* "metrohash.pyx":164
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-  __Pyx_RaiseArgtupleInvalid("hash64_hex", 0, 1, 2, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 164, __pyx_L3_error)
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-  /* "metrohash.pyx":176
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+  __pyx_t_3 = __pyx_f_9metrohash_hash64(__pyx_v_data, 0, &__pyx_t_4); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 179, __pyx_L1_error)
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-/* "metrohash.pyx":179
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   __Pyx_AddTraceback("metrohash.hash64_int", __pyx_clineno, __pyx_lineno, __pyx_filename);
   __Pyx_RefNannyFinishContext();
@@ -2969,7 +2969,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("hash64_int", 0);
 
-  /* "metrohash.pyx":209
+  /* "metrohash.pyx":212
  *     cdef bytes obj
  *     cdef uint64 result
  *     if PyUnicode_Check(data):             # <<<<<<<<<<<<<<
@@ -2979,28 +2979,28 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
   __pyx_t_1 = (PyUnicode_Check(__pyx_v_data) != 0);
   if (__pyx_t_1) {
 
-    /* "metrohash.pyx":210
+    /* "metrohash.pyx":213
  *     cdef uint64 result
  *     if PyUnicode_Check(data):
  *         obj = PyUnicode_AsUTF8String(data)             # <<<<<<<<<<<<<<
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         result = c_metrohash64(<const uint8 *>buf.buf, buf.len, seed)
  */
-    __pyx_t_2 = PyUnicode_AsUTF8String(__pyx_v_data); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 210, __pyx_L1_error)
+    __pyx_t_2 = PyUnicode_AsUTF8String(__pyx_v_data); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 213, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_2);
     __pyx_v_obj = ((PyObject*)__pyx_t_2);
     __pyx_t_2 = 0;
 
-    /* "metrohash.pyx":211
+    /* "metrohash.pyx":214
  *     if PyUnicode_Check(data):
  *         obj = PyUnicode_AsUTF8String(data)
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)             # <<<<<<<<<<<<<<
  *         result = c_metrohash64(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)
  */
-    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_obj, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 211, __pyx_L1_error)
+    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_obj, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 214, __pyx_L1_error)
 
-    /* "metrohash.pyx":212
+    /* "metrohash.pyx":215
  *         obj = PyUnicode_AsUTF8String(data)
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         result = c_metrohash64(<const uint8 *>buf.buf, buf.len, seed)             # <<<<<<<<<<<<<<
@@ -3009,7 +3009,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
  */
     __pyx_v_result = metrohash64(((uint8 const *)__pyx_v_buf.buf), __pyx_v_buf.len, __pyx_v_seed);
 
-    /* "metrohash.pyx":213
+    /* "metrohash.pyx":216
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         result = c_metrohash64(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)             # <<<<<<<<<<<<<<
@@ -3018,7 +3018,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
  */
     PyBuffer_Release((&__pyx_v_buf));
 
-    /* "metrohash.pyx":209
+    /* "metrohash.pyx":212
  *     cdef bytes obj
  *     cdef uint64 result
  *     if PyUnicode_Check(data):             # <<<<<<<<<<<<<<
@@ -3028,7 +3028,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
     goto __pyx_L3;
   }
 
-  /* "metrohash.pyx":214
+  /* "metrohash.pyx":217
  *         result = c_metrohash64(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):             # <<<<<<<<<<<<<<
@@ -3038,7 +3038,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
   __pyx_t_1 = (PyBytes_Check(__pyx_v_data) != 0);
   if (__pyx_t_1) {
 
-    /* "metrohash.pyx":215
+    /* "metrohash.pyx":218
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):
  *         result = c_metrohash64(<const uint8 *>PyBytes_AS_STRING(data),             # <<<<<<<<<<<<<<
@@ -3047,7 +3047,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
  */
     __pyx_v_result = metrohash64(((uint8 const *)PyBytes_AS_STRING(__pyx_v_data)), PyBytes_GET_SIZE(__pyx_v_data), __pyx_v_seed);
 
-    /* "metrohash.pyx":214
+    /* "metrohash.pyx":217
  *         result = c_metrohash64(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):             # <<<<<<<<<<<<<<
@@ -3057,7 +3057,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
     goto __pyx_L3;
   }
 
-  /* "metrohash.pyx":217
+  /* "metrohash.pyx":220
  *         result = c_metrohash64(<const uint8 *>PyBytes_AS_STRING(data),
  *                                PyBytes_GET_SIZE(data), seed)
  *     elif PyObject_CheckBuffer(data):             # <<<<<<<<<<<<<<
@@ -3067,16 +3067,16 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
   __pyx_t_1 = (PyObject_CheckBuffer(__pyx_v_data) != 0);
   if (likely(__pyx_t_1)) {
 
-    /* "metrohash.pyx":218
+    /* "metrohash.pyx":221
  *                                PyBytes_GET_SIZE(data), seed)
  *     elif PyObject_CheckBuffer(data):
  *         PyObject_GetBuffer(data, &buf, PyBUF_SIMPLE)             # <<<<<<<<<<<<<<
  *         result = c_metrohash64(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)
  */
-    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_data, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 218, __pyx_L1_error)
+    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_data, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 221, __pyx_L1_error)
 
-    /* "metrohash.pyx":219
+    /* "metrohash.pyx":222
  *     elif PyObject_CheckBuffer(data):
  *         PyObject_GetBuffer(data, &buf, PyBUF_SIMPLE)
  *         result = c_metrohash64(<const uint8 *>buf.buf, buf.len, seed)             # <<<<<<<<<<<<<<
@@ -3085,7 +3085,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
  */
     __pyx_v_result = metrohash64(((uint8 const *)__pyx_v_buf.buf), __pyx_v_buf.len, __pyx_v_seed);
 
-    /* "metrohash.pyx":220
+    /* "metrohash.pyx":223
  *         PyObject_GetBuffer(data, &buf, PyBUF_SIMPLE)
  *         result = c_metrohash64(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)             # <<<<<<<<<<<<<<
@@ -3094,7 +3094,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
  */
     PyBuffer_Release((&__pyx_v_buf));
 
-    /* "metrohash.pyx":217
+    /* "metrohash.pyx":220
  *         result = c_metrohash64(<const uint8 *>PyBytes_AS_STRING(data),
  *                                PyBytes_GET_SIZE(data), seed)
  *     elif PyObject_CheckBuffer(data):             # <<<<<<<<<<<<<<
@@ -3104,7 +3104,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
     goto __pyx_L3;
   }
 
-  /* "metrohash.pyx":222
+  /* "metrohash.pyx":225
  *         PyBuffer_Release(&buf)
  *     else:
  *         raise _type_error("data", ["basestring", "buffer"], data)             # <<<<<<<<<<<<<<
@@ -3112,7 +3112,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
  * 
  */
   /*else*/ {
-    __pyx_t_2 = PyList_New(2); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 222, __pyx_L1_error)
+    __pyx_t_2 = PyList_New(2); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 225, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_2);
     __Pyx_INCREF(__pyx_n_s_basestring);
     __Pyx_GIVEREF(__pyx_n_s_basestring);
@@ -3120,16 +3120,16 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
     __Pyx_INCREF(__pyx_n_s_buffer);
     __Pyx_GIVEREF(__pyx_n_s_buffer);
     PyList_SET_ITEM(__pyx_t_2, 1, __pyx_n_s_buffer);
-    __pyx_t_4 = __pyx_f_9metrohash__type_error(__pyx_n_s_data, __pyx_t_2, __pyx_v_data); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 222, __pyx_L1_error)
+    __pyx_t_4 = __pyx_f_9metrohash__type_error(__pyx_n_s_data, __pyx_t_2, __pyx_v_data); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 225, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_4);
     __Pyx_DECREF(__pyx_t_2); __pyx_t_2 = 0;
     __Pyx_Raise(__pyx_t_4, 0, 0, 0);
     __Pyx_DECREF(__pyx_t_4); __pyx_t_4 = 0;
-    __PYX_ERR(0, 222, __pyx_L1_error)
+    __PYX_ERR(0, 225, __pyx_L1_error)
   }
   __pyx_L3:;
 
-  /* "metrohash.pyx":223
+  /* "metrohash.pyx":226
  *     else:
  *         raise _type_error("data", ["basestring", "buffer"], data)
  *     return result             # <<<<<<<<<<<<<<
@@ -3137,13 +3137,13 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
  * 
  */
   __Pyx_XDECREF(__pyx_r);
-  __pyx_t_4 = __Pyx_PyInt_From_uint64_t(__pyx_v_result); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 223, __pyx_L1_error)
+  __pyx_t_4 = __Pyx_PyInt_From_uint64_t(__pyx_v_result); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 226, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_4);
   __pyx_r = __pyx_t_4;
   __pyx_t_4 = 0;
   goto __pyx_L0;
 
-  /* "metrohash.pyx":194
+  /* "metrohash.pyx":197
  * 
  * 
  * def hash64_int(data, uint64 seed=0ULL) -> int:             # <<<<<<<<<<<<<<
@@ -3164,7 +3164,7 @@ static PyObject *__pyx_pf_9metrohash_12hash64_int(CYTHON_UNUSED PyObject *__pyx_
   return __pyx_r;
 }
 
-/* "metrohash.pyx":226
+/* "metrohash.pyx":229
  * 
  * 
  * def hash128_int(data, uint64 seed=0ULL) -> int:             # <<<<<<<<<<<<<<
@@ -3212,7 +3212,7 @@ static PyObject *__pyx_pw_9metrohash_15hash128_int(PyObject *__pyx_self, PyObjec
         }
       }
       if (unlikely(kw_args > 0)) {
-        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "hash128_int") < 0)) __PYX_ERR(0, 226, __pyx_L3_error)
+        if (unlikely(__Pyx_ParseOptionalKeywords(__pyx_kwds, __pyx_pyargnames, 0, values, pos_args, "hash128_int") < 0)) __PYX_ERR(0, 229, __pyx_L3_error)
       }
     } else {
       switch (PyTuple_GET_SIZE(__pyx_args)) {
@@ -3225,14 +3225,14 @@ static PyObject *__pyx_pw_9metrohash_15hash128_int(PyObject *__pyx_self, PyObjec
     }
     __pyx_v_data = values[0];
     if (values[1]) {
-      __pyx_v_seed = __Pyx_PyInt_As_uint64_t(values[1]); if (unlikely((__pyx_v_seed == ((uint64)-1)) && PyErr_Occurred())) __PYX_ERR(0, 226, __pyx_L3_error)
+      __pyx_v_seed = __Pyx_PyInt_As_uint64_t(values[1]); if (unlikely((__pyx_v_seed == ((uint64)-1)) && PyErr_Occurred())) __PYX_ERR(0, 229, __pyx_L3_error)
     } else {
       __pyx_v_seed = ((uint64)0ULL);
     }
   }
   goto __pyx_L4_argument_unpacking_done;
   __pyx_L5_argtuple_error:;
-  __Pyx_RaiseArgtupleInvalid("hash128_int", 0, 1, 2, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 226, __pyx_L3_error)
+  __Pyx_RaiseArgtupleInvalid("hash128_int", 0, 1, 2, PyTuple_GET_SIZE(__pyx_args)); __PYX_ERR(0, 229, __pyx_L3_error)
   __pyx_L3_error:;
   __Pyx_AddTraceback("metrohash.hash128_int", __pyx_clineno, __pyx_lineno, __pyx_filename);
   __Pyx_RefNannyFinishContext();
@@ -3248,7 +3248,7 @@ static PyObject *__pyx_pw_9metrohash_15hash128_int(PyObject *__pyx_self, PyObjec
 static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx_self, PyObject *__pyx_v_data, uint64 __pyx_v_seed) {
   Py_buffer __pyx_v_buf;
   PyObject *__pyx_v_obj = 0;
-  std::pair<uint64,uint64>  __pyx_v_result;
+  uint128 __pyx_v_result;
   PyObject *__pyx_r = NULL;
   __Pyx_RefNannyDeclarations
   int __pyx_t_1;
@@ -3261,9 +3261,9 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
   int __pyx_clineno = 0;
   __Pyx_RefNannySetupContext("hash128_int", 0);
 
-  /* "metrohash.pyx":241
+  /* "metrohash.pyx":244
  *     cdef bytes obj
- *     cdef pair[uint64, uint64] result
+ *     cdef uint128 result
  *     if PyUnicode_Check(data):             # <<<<<<<<<<<<<<
  *         obj = PyUnicode_AsUTF8String(data)
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
@@ -3271,28 +3271,28 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
   __pyx_t_1 = (PyUnicode_Check(__pyx_v_data) != 0);
   if (__pyx_t_1) {
 
-    /* "metrohash.pyx":242
- *     cdef pair[uint64, uint64] result
+    /* "metrohash.pyx":245
+ *     cdef uint128 result
  *     if PyUnicode_Check(data):
  *         obj = PyUnicode_AsUTF8String(data)             # <<<<<<<<<<<<<<
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         result = c_metrohash128(<const uint8 *>buf.buf, buf.len, seed)
  */
-    __pyx_t_2 = PyUnicode_AsUTF8String(__pyx_v_data); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 242, __pyx_L1_error)
+    __pyx_t_2 = PyUnicode_AsUTF8String(__pyx_v_data); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 245, __pyx_L1_error)
     __Pyx_GOTREF(__pyx_t_2);
     __pyx_v_obj = ((PyObject*)__pyx_t_2);
     __pyx_t_2 = 0;
 
-    /* "metrohash.pyx":243
+    /* "metrohash.pyx":246
  *     if PyUnicode_Check(data):
  *         obj = PyUnicode_AsUTF8String(data)
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)             # <<<<<<<<<<<<<<
  *         result = c_metrohash128(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)
  */
-    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_obj, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 243, __pyx_L1_error)
+    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_obj, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 246, __pyx_L1_error)
 
-    /* "metrohash.pyx":244
+    /* "metrohash.pyx":247
  *         obj = PyUnicode_AsUTF8String(data)
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         result = c_metrohash128(<const uint8 *>buf.buf, buf.len, seed)             # <<<<<<<<<<<<<<
@@ -3301,7 +3301,7 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
  */
     __pyx_v_result = metrohash128(((uint8 const *)__pyx_v_buf.buf), __pyx_v_buf.len, __pyx_v_seed);
 
-    /* "metrohash.pyx":245
+    /* "metrohash.pyx":248
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
  *         result = c_metrohash128(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)             # <<<<<<<<<<<<<<
@@ -3310,9 +3310,9 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
  */
     PyBuffer_Release((&__pyx_v_buf));
 
-    /* "metrohash.pyx":241
+    /* "metrohash.pyx":244
  *     cdef bytes obj
- *     cdef pair[uint64, uint64] result
+ *     cdef uint128 result
  *     if PyUnicode_Check(data):             # <<<<<<<<<<<<<<
  *         obj = PyUnicode_AsUTF8String(data)
  *         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
@@ -3320,7 +3320,7 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
     goto __pyx_L3;
   }
 
-  /* "metrohash.pyx":246
+  /* "metrohash.pyx":249
  *         result = c_metrohash128(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):             # <<<<<<<<<<<<<<
@@ -3330,7 +3330,7 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
   __pyx_t_1 = (PyBytes_Check(__pyx_v_data) != 0);
   if (__pyx_t_1) {
 
-    /* "metrohash.pyx":247
+    /* "metrohash.pyx":250
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):
  *         result = c_metrohash128(<const uint8 *>PyBytes_AS_STRING(data),             # <<<<<<<<<<<<<<
@@ -3339,7 +3339,7 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
  */
     __pyx_v_result = metrohash128(((uint8 const *)PyBytes_AS_STRING(__pyx_v_data)), PyBytes_GET_SIZE(__pyx_v_data), __pyx_v_seed);
 
-    /* "metrohash.pyx":246
+    /* "metrohash.pyx":249
  *         result = c_metrohash128(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)
  *     elif PyBytes_Check(data):             # <<<<<<<<<<<<<<
@@ -3349,7 +3349,7 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
     goto __pyx_L3;
   }
 
-  /* "metrohash.pyx":249
+  /* "metrohash.pyx":252
  *         result = c_metrohash128(<const uint8 *>PyBytes_AS_STRING(data),
  *                                 PyBytes_GET_SIZE(data), seed)
  *     elif PyObject_CheckBuffer(data):             # <<<<<<<<<<<<<<
@@ -3359,16 +3359,16 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
   __pyx_t_1 = (PyObject_CheckBuffer(__pyx_v_data) != 0);
   if (likely(__pyx_t_1)) {
 
-    /* "metrohash.pyx":250
+    /* "metrohash.pyx":253
  *                                 PyBytes_GET_SIZE(data), seed)
  *     elif PyObject_CheckBuffer(data):
  *         PyObject_GetBuffer(data, &buf, PyBUF_SIMPLE)             # <<<<<<<<<<<<<<
  *         result = c_metrohash128(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)
  */
-    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_data, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 250, __pyx_L1_error)
+    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_data, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 253, __pyx_L1_error)
 
-    /* "metrohash.pyx":251
+    /* "metrohash.pyx":254
  *     elif PyObject_CheckBuffer(data):
  *         PyObject_GetBuffer(data, &buf, PyBUF_SIMPLE)
  *         result = c_metrohash128(<const uint8 *>buf.buf, buf.len, seed)             # <<<<<<<<<<<<<<
@@ -3377,7 +3377,7 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
  */
     __pyx_v_result = metrohash128(((uint8 const *)__pyx_v_buf.buf), __pyx_v_buf.len, __pyx_v_seed);
 
-    /* "metrohash.pyx":252
+    /* "metrohash.pyx":255
  *         PyObject_GetBuffer(data, &buf, PyBUF_SIMPLE)
  *         result = c_metrohash128(<const uint8 *>buf.buf, buf.len, seed)
  *         PyBuffer_Release(&buf)             # <<<<<<<<<<<<<<
@@ -3386,7 +3386,7 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
  */
     PyBuffer_Release((&__pyx_v_buf));
 
-    /* "metrohash.pyx":249
+    /* "metrohash.pyx":252
  *         result = c_metrohash128(<const uint8 *>PyBytes_AS_STRING(data),
  *                                 PyBytes_GET_SIZE(data), seed)
  *     elif PyObject_CheckBuffer(data):             # <<<<<<<<<<<<<<
@@ -3396,7 +3396,7 @@ static PyObject *__pyx_pf_9metrohash_14hash128_int(CYTHON_UNUSED PyObject *__pyx
     goto __pyx_L3;
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-  /* "metrohash.pyx":254
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-  /* "metrohash.pyx":273
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-    /* "metrohash.pyx":274
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-    /* "metrohash.pyx":273
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-  /* "metrohash.pyx":271
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-  /* "metrohash.pyx":277
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-    /* "metrohash.pyx":278
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-    /* "metrohash.pyx":279
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-    /* "metrohash.pyx":277
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-  /* "metrohash.pyx":276
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-  /* "metrohash.pyx":281
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-    /* "metrohash.pyx":303
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-    /* "metrohash.pyx":304
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-    /* "metrohash.pyx":305
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@@ -3865,7 +3865,7 @@ static PyObject *__pyx_pf_9metrohash_11MetroHash64_6update(struct __pyx_obj_9met
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-  /* "metrohash.pyx":306
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@@ -3885,7 +3885,7 @@ static PyObject *__pyx_pf_9metrohash_11MetroHash64_6update(struct __pyx_obj_9met
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-    /* "metrohash.pyx":307
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-    /* "metrohash.pyx":306
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@@ -3904,7 +3904,7 @@ static PyObject *__pyx_pf_9metrohash_11MetroHash64_6update(struct __pyx_obj_9met
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-  /* "metrohash.pyx":309
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-    /* "metrohash.pyx":310
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-    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_data, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 310, __pyx_L1_error)
+    __pyx_t_3 = PyObject_GetBuffer(__pyx_v_data, (&__pyx_v_buf), PyBUF_SIMPLE); if (unlikely(__pyx_t_3 == ((int)-1))) __PYX_ERR(0, 313, __pyx_L1_error)
 
-    /* "metrohash.pyx":311
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   /* "metrohash.pyx":14
  * __email__   = "escherba+metrohash@gmail.com"
- * __version__ = "0.1.1.post2"
+ * __version__ = "0.1.1.post3"
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-  /* "metrohash.pyx":67
- *         void Hash(const uint8_t* buffer, const uint64_t length, uint8_t* const hash, const uint64_t seed)
+  /* "metrohash.pyx":68
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  * 
  * import sys             # <<<<<<<<<<<<<<
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-  /* "metrohash.pyx":83
+  /* "metrohash.pyx":85
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  * 
  * if sys.version_info < (3, ):             # <<<<<<<<<<<<<<
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-  __Pyx_GetModuleGlobalName(__pyx_t_1, __pyx_n_s_sys); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 83, __pyx_L1_error)
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-    /* "metrohash.pyx":84
+    /* "metrohash.pyx":86
  * 
  * if sys.version_info < (3, ):
  *     def bytes2hex(bs: bytes) -> str:             # <<<<<<<<<<<<<<
  *         return bs.encode("hex")
  * else:
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-    __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_9metrohash_1bytes2hex, NULL, __pyx_n_s_metrohash); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 84, __pyx_L1_error)
+    __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_9metrohash_1bytes2hex, NULL, __pyx_n_s_metrohash); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 86, __pyx_L1_error)
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-    if (PyDict_SetItem(__pyx_d, __pyx_n_s_bytes2hex, __pyx_t_1) < 0) __PYX_ERR(0, 84, __pyx_L1_error)
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-    /* "metrohash.pyx":83
+    /* "metrohash.pyx":85
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@@ -6385,7 +6385,7 @@ if (!__Pyx_RefNanny) {
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-  /* "metrohash.pyx":87
+  /* "metrohash.pyx":89
  *         return bs.encode("hex")
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  *     def bytes2hex(bs: bytes) -> str:             # <<<<<<<<<<<<<<
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+    __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_9metrohash_3bytes2hex, NULL, __pyx_n_s_metrohash); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 89, __pyx_L1_error)
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-    if (PyDict_SetItem(__pyx_d, __pyx_n_s_bytes2hex, __pyx_t_1) < 0) __PYX_ERR(0, 87, __pyx_L1_error)
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     __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
   }
   __pyx_L2:;
 
-  /* "metrohash.pyx":164
+  /* "metrohash.pyx":167
  * 
  * 
  * def hash64_hex(data, uint64_t seed=0ULL) -> str:             # <<<<<<<<<<<<<<
  *     """Obtain a 64-bit hash from data using MetroHash-64.
  *     Args:
  */
-  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_9metrohash_9hash64_hex, NULL, __pyx_n_s_metrohash); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 164, __pyx_L1_error)
+  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_9metrohash_9hash64_hex, NULL, __pyx_n_s_metrohash); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 167, __pyx_L1_error)
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-  if (PyDict_SetItem(__pyx_d, __pyx_n_s_hash64_hex, __pyx_t_1) < 0) __PYX_ERR(0, 164, __pyx_L1_error)
+  if (PyDict_SetItem(__pyx_d, __pyx_n_s_hash64_hex, __pyx_t_1) < 0) __PYX_ERR(0, 167, __pyx_L1_error)
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
-  /* "metrohash.pyx":179
+  /* "metrohash.pyx":182
  * 
  * 
  * def hash128_hex(data, uint64_t seed=0ULL) -> str:             # <<<<<<<<<<<<<<
  *     """Obtain a 128-bit hash from data using MetroHash-128.
  *     Args:
  */
-  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_9metrohash_11hash128_hex, NULL, __pyx_n_s_metrohash); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 179, __pyx_L1_error)
+  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_9metrohash_11hash128_hex, NULL, __pyx_n_s_metrohash); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 182, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
-  if (PyDict_SetItem(__pyx_d, __pyx_n_s_hash128_hex, __pyx_t_1) < 0) __PYX_ERR(0, 179, __pyx_L1_error)
+  if (PyDict_SetItem(__pyx_d, __pyx_n_s_hash128_hex, __pyx_t_1) < 0) __PYX_ERR(0, 182, __pyx_L1_error)
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
-  /* "metrohash.pyx":194
+  /* "metrohash.pyx":197
  * 
  * 
  * def hash64_int(data, uint64 seed=0ULL) -> int:             # <<<<<<<<<<<<<<
  *     """Obtain a 64-bit hash from data using MetroHash-64.
  *     Args:
  */
-  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_9metrohash_13hash64_int, NULL, __pyx_n_s_metrohash); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 194, __pyx_L1_error)
+  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_9metrohash_13hash64_int, NULL, __pyx_n_s_metrohash); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 197, __pyx_L1_error)
   __Pyx_GOTREF(__pyx_t_1);
-  if (PyDict_SetItem(__pyx_d, __pyx_n_s_hash64_int, __pyx_t_1) < 0) __PYX_ERR(0, 194, __pyx_L1_error)
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   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
-  /* "metrohash.pyx":226
+  /* "metrohash.pyx":229
  * 
  * 
  * def hash128_int(data, uint64 seed=0ULL) -> int:             # <<<<<<<<<<<<<<
  *     """Obtain a 128-bit hash from data using MetroHash-128.
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-  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_9metrohash_15hash128_int, NULL, __pyx_n_s_metrohash); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 226, __pyx_L1_error)
+  __pyx_t_1 = PyCFunction_NewEx(&__pyx_mdef_9metrohash_15hash128_int, NULL, __pyx_n_s_metrohash); if (unlikely(!__pyx_t_1)) __PYX_ERR(0, 229, __pyx_L1_error)
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-  if (PyDict_SetItem(__pyx_d, __pyx_n_s_hash128_int, __pyx_t_1) < 0) __PYX_ERR(0, 226, __pyx_L1_error)
+  if (PyDict_SetItem(__pyx_d, __pyx_n_s_hash128_int, __pyx_t_1) < 0) __PYX_ERR(0, 229, __pyx_L1_error)
   __Pyx_DECREF(__pyx_t_1); __pyx_t_1 = 0;
 
   /* "metrohash.pyx":1
diff --git a/include/metrohash.h b/src/metrohash.h
similarity index 100%
rename from include/metrohash.h
rename to src/metrohash.h
diff --git a/src/metrohash.pyx b/src/metrohash.pyx
index 713d41f..2fe8526 100644
--- a/src/metrohash.pyx
+++ b/src/metrohash.pyx
@@ -10,7 +10,7 @@ Python wrapper for MetroHash, a fast non-cryptographic hashing algorithm
 
 __author__  = "Eugene Scherba"
 __email__   = "escherba+metrohash@gmail.com"
-__version__ = "0.1.1.post2"
+__version__ = "0.1.1.post3"
 __all__     = [
     "metrohash64",
     "metrohash128",
@@ -25,7 +25,7 @@ cdef extern from * nogil:
     ctypedef unsigned long long int uint64_t
 
 
-cdef extern from "<utility>" namespace "std":
+cdef extern from "<utility>" namespace "std" nogil:
     cdef cppclass pair[T, U]:
         T first
         U second
@@ -44,25 +44,26 @@ cdef extern from "metro.h" nogil:
     ctypedef uint8_t uint8
     ctypedef uint32_t uint32
     ctypedef uint64_t uint64
-    ctypedef pair uint128
-    cdef uint64 c_metrohash64 "metrohash64" (const uint8* buf, uint64 length, uint64 seed)
+    ctypedef pair[uint64, uint64] uint128
+    cdef uint64 c_metrohash64 "metrohash64" (const uint8* key, uint64 length, uint64 seed)
     cdef uint64 c_bytes2int64 "bytes2int64" (uint8* const array)
-    cdef uint128[uint64,uint64] c_bytes2int128 "bytes2int128" (uint8* const array)
-    cdef uint128[uint64,uint64] c_metrohash128 "metrohash128" (const uint8* buf, uint64 length, uint64 seed)
+    cdef uint128 c_bytes2int128 "bytes2int128" (uint8* const array)
+    cdef uint128 c_metrohash128 "metrohash128" (const uint8* key, uint64 length, uint64 seed)
     cdef cppclass CCMetroHash64 "MetroHash64":
         CCMetroHash64(const uint64 seed)
         void Initialize(const uint64 seed)
-        void Update(const uint8* buf, const uint64 length)
+        void Update(const uint8* key, const uint64 length)
         void Finalize(uint8* const result)
         @staticmethod
-        void Hash(const uint8_t* buffer, const uint64_t length, uint8_t* const hash, const uint64_t seed)
+        void Hash(const uint8_t* key, const uint64_t length, uint8_t* const out, const uint64_t seed)
     cdef cppclass CCMetroHash128 "MetroHash128":
         CCMetroHash128(const uint64 seed)
         void Initialize(const uint64 seed)
-        void Update(const uint8* buf, const uint64 length)
+        void Update(const uint8* key, const uint64 length)
         void Finalize(uint8* const result)
         @staticmethod
-        void Hash(const uint8_t* buffer, const uint64_t length, uint8_t* const hash, const uint64_t seed)
+        void Hash(const uint8_t* key, const uint64_t length, uint8_t* const out, const uint64_t seed)
+
 
 import sys
 from cpython cimport long
@@ -78,6 +79,7 @@ from cpython.unicode cimport PyUnicode_AsUTF8String
 from cpython.bytes cimport PyBytes_Check
 from cpython.bytes cimport PyBytes_GET_SIZE
 from cpython.bytes cimport PyBytes_AS_STRING
+from cpython.bytes cimport PyBytes_FromStringAndSize
 
 
 if sys.version_info < (3, ):
@@ -161,6 +163,7 @@ cpdef bytes hash128(data, uint64_t seed=0ULL):
     return bytes(out)
 
 
+
 def hash64_hex(data, uint64_t seed=0ULL) -> str:
     """Obtain a 64-bit hash from data using MetroHash-64.
     Args:
@@ -237,7 +240,7 @@ def hash128_int(data, uint64 seed=0ULL) -> int:
     """
     cdef Py_buffer buf
     cdef bytes obj
-    cdef pair[uint64, uint64] result
+    cdef uint128 result
     if PyUnicode_Check(data):
         obj = PyUnicode_AsUTF8String(data)
         PyObject_GetBuffer(obj, &buf, PyBUF_SIMPLE)
@@ -420,5 +423,5 @@ cdef class MetroHash128(object):
         """
         cdef uint8 buf[16]
         self._m.Finalize(buf)
-        cdef pair[uint64, uint64] result = c_bytes2int128(buf)
+        cdef uint128 result = c_bytes2int128(buf)
         return 0x10000000000000000L * long(result.first) + long(result.second)
diff --git a/include/metrohash128.h b/src/metrohash128.h
similarity index 100%
rename from include/metrohash128.h
rename to src/metrohash128.h
diff --git a/include/metrohash128crc.h b/src/metrohash128crc.h
similarity index 100%
rename from include/metrohash128crc.h
rename to src/metrohash128crc.h
diff --git a/include/metrohash64.h b/src/metrohash64.h
similarity index 100%
rename from include/metrohash64.h
rename to src/metrohash64.h
diff --git a/include/platform.h b/src/platform.h
similarity index 100%
rename from include/platform.h
rename to src/platform.h