fix: recognise set operation quantifiers written in any case #812

Job	Run time
Grammar Choice Conflicts	29s
Gradle Check (macos-latest)	3m 15s
Gradle Check (ubuntu-latest)	3m 5s
Gradle Check (windows-latest)	3m 17s
Maven Verify (windows-latest)	3m 47s
Maven Verify (ubuntu-latest)	2m 52s
Maven Verify (macos-latest)	3m 9s
Build & Deploy Sphinx Docs	-1s
Gradle Publish (Maven Central)	-1s
	19m 52s

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