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Description
Spurred by #347 .
Since Google's monorepo has warnings-as-errors turned on, I did the same for the java-json-tools repos so that new errors requiring internal patching would be caught upstream before commit. However, the new https://github.com/dependabot suggestion of pulling in 2.4.0 finds new errorprone issues, which causes the builds to fail.
This is a FR to locally pull in 2.4.0, and commit fixes to the issues so the new error prone is clean.
/cc @huggsboson