Message 414803 - Python tracker

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Draft PR is up for consideration. Perf data in https://gist.github.com/carljm/987a7032ed851a5fe145524128bdb67a

Overall it seems like the base implementation is perf neutral -- maybe a slight impact on the pickle benchmarks? With all module global dicts (uselessly) watched, there are a few more benchmarks with small regressions, but also some with small improvements (just noise I guess?) -- overall still pretty close to neutral.

Comments welcome!