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bpo-43503: Make limited API objects effectively immutable. - #24828

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ericsnowcurrently:globals-immortal-objects-flags

Commits on Mar 12, 2021
- Add support for immortal objects (large neg int means "immortal").
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  4951703
- Switch to a positive number.
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  4b1eea3
- Add Py_IMMORTAL_CONST_REFCOUNTS.
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- Add a NEWS entry.
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- Add docs.
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- Drop special handling of negative refcounts.
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- Do not reset the refcount in _PyObject_IsImmortal().
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  2536e8b
- Do not allow immortal objects in the limited API.
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  518e9e8
- Do not re-declare _PyObject_IsImmortal.
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  277e1ea
- Go back to using Py_SET_REFCNT() in _Py_NewReference().
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  edef342
- Fix an accidental line removal.
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  4d22e00
- Add more comments and drop the internal-only macros from the docs.
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  838f88f
Commits on Mar 15, 2021