[issue33803] contextvars: hamt_alloc() must initialize h_root and h_count fields

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> I'd love to have a flag to turn this on, or maybe we should enable it for -X dev.

Well, there is already a public API to do it manually: gc.set_threshold(5).

I'm not sure about a threshold of 5 for -X dev: that's very very low and so kill performances. -X dev can be slower, not but 10x slower for example. I didn't measure performance.

Such bug is rare, so I'm not sure about putting gc.set_threshold(5) in -X dev.

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