fix(singleflight): drop duplicate keys outside the table lock - #349
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Summary
Prevent a deadlock when the destructor of a duplicate singleflight key calls back into the group. Use explicit lookup and insertion so unused keys are dropped after releasing the table lock.
Add regression coverage for both
workandtry_work, verify coalesced results, and record the fix in the changelog. The regression test uses the existing deadlock watchdog and fails on the previous implementation.Validation:
cargo x test(619 passing tests),cargo x check(26 feature configurations), andcargo x lint.