Retract the claim that this is always safe if PyMem_{Del, DEL, Free, FREE} are called without the GIL.  It's incredibly unlikely to fail, but I can't make this bulletproof without either adding a lock for exclusion, or giving up on growing the arena base-address vector (it would be safe if this were a static array).
Retract the claim that this is always safe if PyMem_{Del, DEL, Free, FREE}
are called without the GIL.  It's incredibly unlikely to fail, but I can't
make this bulletproof without either adding a lock for exclusion, or
giving up on growing the arena base-address vector (it would be safe if
this were a static array).

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator