Protect shared dialect presets from external mutation #835

Job	Run time
Grammar Choice Conflicts	29s
Gradle Check (windows-latest)	4m 4s
Gradle Check (ubuntu-latest)	2m 43s
Gradle Check (macos-latest)	2m 30s
Maven Verify (macos-latest)	4m 7s
Maven Verify (windows-latest)	3m 28s
Maven Verify (ubuntu-latest)	2m 54s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	20m 15s

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