* 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
* Remove unsafe ctx cast in make_class
Use Context::genesis() directly in make_class to obtain
&'static Context, eliminating the raw pointer cast.
* make_class -> make_static_type
Defer locals dict allocation for function frames until first access.
Most function frames only use fastlocals and never touch the locals
dict, so this skips one dict heap allocation per function call.
Also remove a redundant code.clone() in invoke_with_locals.
Func call ~23% faster, method call ~15% faster in benchmarks.
