remove unused optr code

src/borg/item.pyi

@@ -128,9 +128,6 @@ class Item(PropDict):
     def _is_type(self, typetest: Callable) -> bool: ...
     @classmethod
     def create_deleted(self, path) -> Item: ...
-    @classmethod
-    def from_optr(self, optr: Any) -> Item: ...
-    def to_optr(self) -> Any: ...
     @property
     def atime(self) -> int: ...
     @atime.setter

src/borg/item.pyx

@@ -12,11 +12,6 @@ from .helpers.msgpack import timestamp_to_int, int_to_timestamp, Timestamp
 from .helpers.time import OutputTimestamp, safe_timestamp
 
 
-cdef extern from "_item.c":
-    object _object_to_optr(object obj)
-    object _optr_to_object(object bytes)
-
-
 
 
 
@@ -337,25 +332,6 @@ cdef class Item(PropDict):
                 setattr(self, attr, size)
         return size
 
-    def to_optr(self):
-        """
-        Return an "object pointer" (optr), an opaque bag of bytes.
-        The return value is effectively a reference to this object
-        that can be passed exactly once to Item.from_optr to get this
-        object back.
-
-        to_optr/from_optr must be used symmetrically,
-        don't call from_optr multiple times.
-
-        This object can't be deallocated after a call to to_optr()
-        until from_optr() is called.
-        """
-        return _object_to_optr(self)
-
-    @classmethod
-    def from_optr(self, optr):
-        return _optr_to_object(optr)
-
     @classmethod
     def create_deleted(cls, path):
         return cls(deleted=True, chunks=[], mode=0, path=path)

src/borg/testsuite/item_test.py

@@ -152,11 +152,6 @@ def test_item_file_size_no_chunks():
     assert item.get_size() == 0
 
 
-def test_item_optr():
-    item = Item()
-    assert Item.from_optr(item.to_optr()) is item
-
-
 @pytest.mark.parametrize(
     "chunk_a, chunk_b, chunks_equal",
     [