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@ncoghlan I took a quick look at the PEP...
I'm a bit worried about:
> On optimised frames, the Python level f_locals API will become a direct read/write proxy for the frame's local and closure variable storage, and hence no longer support storing additional data that doesn't correspond to a local or closure variable on the underyling frame object.
In particular, it's common for a debugger to evaluate expressions in a context that would change the locals to add new variables.
i.e.: stopping at a breakpoint and doing 2 `exec` calls with frame.f_locals with:
import some_module
v = some_module.compute(xxx)
So, it's expected that `some_module` and `v` would be in the locals at this point.
Right now after each line of the evaluation, a `PyFrame_FastToLocals` must be called so things work as they should, but given that the PEP explicitly says that it should be deprecated, and this being a common feature for a debugger, what'd be the proper way to support that?
p.s.: should I ask such questions regarding the PEP somewhere else instead of this issue or is this an appropriate place?