I need some help with https://trac.sagemath.org/ticket/29139
If you load a cython file into a sage session the default cython directives
are different from the directives on compile time. This might lead to
different behaviour or errors, e.g. the following fails:
sage: %%cython
....: include "sage/data_structures/bitset.pxi"
If I understand correctly the cython directives while building sage are
located in `src/sage_setup/command/sage_build_cython.py`:
153 self.cython_directives = dict(
154 auto_pickle=False,
155 autotestdict=False,
156 cdivision=True,
157 embedsignature=True,
158 fast_getattr=True,
159 language_level="3str",
160 preliminary_late_includes_cy28=True,
161 profile=self.profile,
162 )
The directive when loading into sage are located in
`src/sage/misc/cython.py`.
317 directives = dict(language_level=sys.version_info[0])
The error is caused by `cdivision=True` missing. Is it acceptable to add
it? Which others should be added?
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