[BUG] Unable to declare a staticmethod func(cython.double v) -> cython.double in pure python

[jtoledo1974]

Describe the bug

I have the following function in a compilable .py file

@cython.cclass
class TestClass:

    @staticmethod
    @cython.cfunc
    def func(v: cython.double) -> cython.double:
        return v + 1.0

With a corresponding .pxd file having

cdef class TestClass:

    @staticmethod
    cdef double func(double v)

When I try to compile it I get the following error:

(venv311) C:\Users\Juan\cruji-enaire>python setup.py build_ext --inplace
Compiling src/crujisim/cythontests.py because it changed.
[1/1] Cythonizing src/crujisim/cythontests.py

Error compiling Cython file:
------------------------------------------------------------
...
    return a

@cython.cclass
class TestClass:

    @staticmethod
    ^
------------------------------------------------------------

src\crujisim\cythontests.py:515:4: Signature not compatible with previous declaration

Error compiling Cython file:
------------------------------------------------------------
...
cdef class TestClass:

    @staticmethod
    cdef double func(double v)                    ^
------------------------------------------------------------

src\crujisim\cythontests.pxd:4:20: Previous declaration is here
Traceback (most recent call last):
  File "C:\Users\Juan\cruji-enaire\setup.py", line 11, in <module>
    cythonized = cythonize(["src/crujisim/mathutil.py",
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\Juan\venv311\Lib\site-packages\Cython\Build\Dependencies.py", line 1129, in cythonize
    cythonize_one(*args)
  File "C:\Users\Juan\venv311\Lib\site-packages\Cython\Build\Dependencies.py", line 1296, in cythonize_one
    raise CompileError(None, pyx_file)
Cython.Compiler.Errors.CompileError: src/crujisim/cythontests.py

Yet, if I rename the file to pyx and rewrite the function as

cdef class TestClass:

    @staticmethod
    cdef double func(v: double):
        return v + 1.0

It does compile properly

Expected behaviour

I expected the function to compile correctly in pure python, since it is equivalent

Environment

OS: Windows
Python version [e.g. 3.11]
Cython version [e.g. 3.0.0a11]

Additional context

No response

[jtoledo1974]

I'm also getting a similar thing with another method returning int.

This doesn't work

@cython.cclass
class TestClass:
    @cython.ccall
    def intfunc(self, v: cython.int) -> cython.int:
        return v + 1

With the corresponding pxd file

cdef class TestClass:
    cpdef int intfunc(self, int v)

But this does work with the same .pxd file

cdef class TestClass:
   
    cpdef int intfunc(self, int v):
        return v + 1

[0dminnimda]

This looks like a wrong behavior