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Validate every UPDATE assignment through shared UpdateSet traversal (… #850

Job	Run time
Grammar Choice Conflicts	1m 9s
Gradle Check (macos-latest)	4m 9s
Gradle Check (ubuntu-latest)	3m 58s
Gradle Check (windows-latest)	4m 46s
Maven Verify (ubuntu-latest)	3m 5s
Maven Verify (macos-latest)	4m 24s
Maven Verify (windows-latest)	4m 14s
Gradle Publish (Maven Central)	4m 12s
Build & Deploy Sphinx Docs	4m 29s
	34m 26s