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perf: cache feature configuration lookups on the parse hot path #1334

Job	Run time
Gradle Check (ubuntu-latest)	3m 27s
Grammar Choice Conflicts	35s
Gradle Check (macos-latest)	2m 38s
Gradle Check (windows-latest)	5m 18s
Maven Verify (ubuntu-latest)	4m 15s
Maven Verify (windows-latest)	4m 54s
Maven Verify (macos-latest)	6m 5s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	27m 12s