Backport of "clock: Avoid creating a weakref with every entry" into 1.20
Backport of !2530 (merged) "clock: Avoid creating a weakref with every entry".
Commits:
- 15c69c17 clock: Avoid creating a weakref with every entry
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Backport of !2530 (merged) "clock: Avoid creating a weakref with every entry".
Commits: