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04cf5dacca
* Object header slimming: prefix allocation for ObjExt Extract dict, weak_list, and slots fields from PyInner<T> into a separate ObjExt struct allocated as a prefix before PyInner using Layout::extend(). Objects that don't need these fields (int, str, float, list, tuple, dict, etc.) skip the prefix entirely. - Add HAS_WEAKREF flag to PyTypeFlags for per-type weakref control - Add HAS_EXT bit to GcBits indicating prefix presence - Define ObjExt struct with dict, weak_list, slots - Shrink PyInner header from ~80-88 bytes to ~32 bytes for lightweight objects - Update all accessor methods to go through ext_ref() - Update bootstrap type hierarchy to use prefix allocation - Add __weakref__ getset descriptor for heap types - Set HAS_WEAKREF on builtin types that support weak references - Remove test_weak_keyed_bad_delitem expectedFailure (now passes) * Add HAS_WEAKREF to _asyncio Future/Task, rename weakref helpers - Add HAS_WEAKREF flag to PyFuture and PyTask (matches CPython) - Rename subtype_getweakref/setweakref to subtype_get_weakref/set_weakref to fix cspell unknown word lint * Add HAS_WEAKREF to array, deque, _grouper; remove expectedFailure markers - Add HAS_WEAKREF to PyArray and PyDeque (matches CPython) - Add HAS_WEAKREF to PyItertoolsGrouper (internal use by groupby) - Remove 6 expectedFailure markers from test_dataclasses for weakref/slots tests that now pass * Add HAS_WEAKREF to code, union, partial, lock, IO, mmap, sre, sqlite3, typevar types Add HAS_WEAKREF flag to built-in types that support weakref: - PyCode, PyUnion, PyPartial, Lock, RLock - All IO base/concrete classes (_IOBase, _RawIOBase, _BufferedIOBase, _TextIOBase, BufferedReader, BufferedWriter, BufferedRandom, BufferedRWPair, TextIOWrapper, StringIO, BytesIO, FileIO, WindowsConsoleIO) - PyMmap, sre Pattern, sqlite3 Connection/Cursor - TypeVar, ParamSpec, ParamSpecArgs, ParamSpecKwargs, TypeVarTuple Remove 3 expectedFailure markers from test_descr for now-passing tests. * Add HAS_DICT to type flags and handle non-METHOD/CLASS in descr_get - Add HAS_DICT flag to PyType (type metaclass) alongside existing HAS_WEAKREF. All type objects are instances of type and need dict support, matching CPython's PyType_Type. - Replace unimplemented!() in PyMethodDescriptor::descr_get with fallback to bind obj directly, matching CPython's method_get which uses PyCFunction_NewEx for non-METH_METHOD methods. * Fix ext detection, HeapMethodDef ownership, WASM error - Remove HAS_EXT gc_bits flag; detect ext from type flags using raw pointer reads to avoid Stacked Borrows violations - Store HeapMethodDef owner in payload instead of dict hack - Clear dict entries in gc_clear_raw to break cycles - Add WASM error fallback when exception serialization fails