- Update to 3.0.0~b3:
* Features added
* Custom buffer slot methods are now supported in the Limited C-API of
Python 3.9+. Patch by Lisandro Dalcin. (Github issue :issue:`5422`)
* The extern "C" and extern "C++" markers that Cython generates for public
functions can now be controlled by setting the C macro CYTHON_EXTERN_C.
* The Python int handling code was adapted to make use of the new PyLong
internals in CPython 3.12. (Github issue :issue:`5353`)
* Conversion of Python ints to C int128 is now always supported, although
slow if dedicated C-API support is missing (_PyLong_AsByteArray()),
specifically in the Limited C-API. (Github issue :issue:`5419`)
* The exception handling code was adapted to CPython 3.12. (Github
issue :issue:`5442`)
* The dataclass implementation was adapted to support Python 3.12. (Github
issue :issue:`5346`)
* The normal @dataclasses.dataclass and @functools.total_ordering
decorators can now be used on extension types. Using the corresponding
@cython.* deorators with automatically turn a Python class into an
extension type (no need for @cclass). (Github issue :issue:`5292`)
* Multiplying a sequence by a C integer avoids creating an intermediate
Python integer.
* ctuples can now be assigned from arbitrary sequences, not just Python
tuples.
* A new directive embedsignature.format was added to select the format
of the docstring embedded signatures between python, c and argument
clinic. Patch by Lisandro Dalcin. (Github issue :issue:`5415`)
* Some invalid directive usages are now detected and rejected, e.g. using
@ccall together with @cfunc, and applying @cfunc to a @ufunc. Cython also
warns now when a directive is applies needlessly. (Github issue
:issue:`5399` et al.)