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Spec: N-12 thread-local condition for borrowed reads on 3.15t - #198
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…cal objects on 3.15t Refs #193
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SPEC N-12 states decision D5: on free-threaded 3.15t, borrowed field reads and refcount-pair elision apply only to objects proven thread-local; other reads take a real reference or read inside a per-object critical section. The design text (typedpython.md §4.3.4 나) already says this.
Refs #193 (stays open: the FT stress test under ASan/TSan lands with the N-12 implementation).