Nick Coghlan <[email protected]> added the comment:
We're OK with the idea that installing a trace function might automatically
turn off various compiler and interpreter managed optimisations (it's similar
to how requesting or implying reliance on full frame support in other
implementations can disable various optimisations). For trace hooks like
coverage tools and debuggers, that's often downright desirable, since it makes
the runtime behaviour correlate more directly with the source code.
What we're aiming to avoid is requiring that implementations make the assertion
in "a = 1; locals('a') = 2; assert a == 2" pass at function scope, and if
anything, we'd prefer to make it a requirement for that assertion to *fail*.
Requiring locals to actually *be* a write-through proxy (for all locals, not
just cell references) would revert Python's semantics to the state they were in
before the "fast locals" concept was first introduced, and we have no intention
of going back there.
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Python tracker <[email protected]>
<https://bugs.python.org/issue30744>
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