Sam Gross d66c08aa75 gh-128923: Use zero to indicate unassigned unique id (#128925) ...

In the free threading build, the per thread reference counting uses a
unique id for some objects to index into the local reference count
table. Use 0 instead of -1 to indicate that the id is not assigned. This
avoids bugs where zero-initialized heap type objects look like they have
a unique id assigned.

2025-01-17 16:42:27 +01:00

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