[issue42197] Disable automatic update of frame locals during tracing

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

I don't think so.
Tracing is already somewhat fragile, see https://bugs.python.org/issue30744.
Making it more complex is likely to add more bugs.

PEP 558 should help, as f_locals becomes a proxy. 
There are some minor issues with PEP 558 (I'm not convinced that it is completely robust), but it should fix this issue.

Ultimately, what we need is a decent debugger API, something along the lines of the JVMTI.

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