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Spotbugs correctly reported a race condition where the check for insertion of a value might report the value is missing then another thread inserted the value before the current thread performed the `put`. Simpler to `put` the value every time the method is called and then check for the rare case when the value that was put is smaller than the value that was there perviously. Repository size cache is used as a hint. Errors in the size cache may lead to suboptimal choices temporarily, but they should not lead to incorrect behavior.
Add spotbugs exclusions reported as part of the increased checks.
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Increase spotbugs checks
Increases spotbugs checks by reducing the threshold to "Low". Also resolves a few spotbugs warnings by code corrections.
Inspired by a NonNull annotation in #1468 that should have reported a spotbugs warning and did not.
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