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fix: allow exists as an unquoted identifier #1297

Job	Run time
Gradle Check (windows-latest)	1m 28s
Gradle Check (ubuntu-latest)	1m 13s
Grammar Choice Conflicts	31s
Gradle Check (macos-latest)	1m 6s
Maven Verify (${{ matrix.os }})	-1s
Gradle Publish (Maven Central)	-1s
Build & Deploy Sphinx Docs	-1s
	4m 15s