fix: accept identity RESTART values without WITH #958

Job	Run time
Gradle Check (ubuntu-latest)	3m 42s
Gradle Check (macos-latest)	2m 45s
Gradle Check (windows-latest)	4m 35s
Grammar Choice Conflicts	34s
Maven Verify (ubuntu-latest)	4m 2s
Maven Verify (macos-latest)	4m 32s
Maven Verify (windows-latest)	2m 57s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	0s
	23m 7s

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