Preserve string-keyed map hardening for ConcurrentMap#3042
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Summary
This change preserves Gson's existing string-keyed map hardening behavior for
ConcurrentMap<String, ...>interface targets.Map<String, ...>currently usesLinkedTreeMapto avoid hash-table collisionbehavior on older runtimes.
ConcurrentMap<String, ...>was instead resolved toConcurrentHashMap; this change resolves string-keyed concurrent map interfacetargets to
ConcurrentSkipListMapwhile preservingConcurrentHashMapfornon-string keys and explicit
ConcurrentHashMaptargets.Tests
mise x java@temurin-17 maven@3.9.11 -- mvn -pl gson -Dtest=MapTest testmise x java@temurin-17 maven@3.9.11 -- mvn -pl gson spotless:check