PEP draft: Safer mutability semantics for the buffer protocol

[sgeisenh (Samuel Eisenhandler)]

Links:
Alex’s blog post: Buffers on the edge: Python and Rust · Alex Gaynor
Petr’s response to Alex’s blog post: Introspection and "mutable XOR shared" semantics for PyBuffer
LWN discussion: Progress in wrangling the Python C API [LWN.net]