[pull] main from python:main#1121
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…H-150719) state_init() always did PyMem_New(state->mark, groups*2), which for a pattern with no capturing groups is PyMem_Malloc(0) -- a real allocation (plus matching free) on every match/search/fullmatch call, for an array that is never read: groupless patterns emit no MARK opcodes and group 0's span is taken from state->start/ptr. Guard the allocation with `if (pattern->groups)`. state->mark stays NULL (set by the preceding memset), and both the error path and state_fini already PyMem_Free(NULL) safely.
…lasses (GH-150682) Always use the directive and the role "class" instead of "data" for NoneType, NotImplementedType and EllipsisType.
Use the "class" directive instead of "data" for ReferenceType, ProxyType and CallableProxyType.
Use the directive and the role "class" instead of "data" for classes exposed in the types module.
GH-150677) Use the directive "class" instead of "data" for ParamSpecArgs and ParamSpecKwargs.
Deleting the `row_factory` or `text_factory` attribute is no longer allowed.
…H-149080) Replace the insertion sort used for canonical ordering of combining characters with a hybrid approach: insertion sort for short runs (< 20) and counting sort for longer runs, reducing worst-case complexity from O(n^2) to O(n). This prevents denial of service via crafted Unicode strings with many combining characters in alternating CCC order. Co-authored-by: ch4n3-yoon <ch4n3.yoon@gmail.com> Co-authored-by: Seokchan Yoon <13852925+ch4n3-yoon@users.noreply.github.com> Co-authored-by: Stan Ulbrych <stan@python.org> Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com> Co-authored-by: Petr Viktorin <encukou@gmail.com> Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Maurycy Pawłowski-Wieroński <maurycy@maurycy.com>
…150502) The fallback for systems with no mpdecimal .pc files used AC_LINK_IFELSE directly, which relied on LIBMPDEC_LIBS being set. On failure this was empty so the link test ran without -lmpdec. Use AC_CHECK_HEADER and AC_CHECK_LIB instead.
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