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refactor: share expression parsing fallback logic #1403

Job	Run time
Grammar Choice Conflicts	23s
Gradle Check (ubuntu-latest)	2m 54s
Gradle Check (macos-latest)	2m 42s
Gradle Check (windows-latest)	5m 16s
Maven Verify (ubuntu-latest)	3m 4s
Maven Verify (macos-latest)	6m 25s
Maven Verify (windows-latest)	3m 24s
Build & Deploy Sphinx Docs	0s
Gradle Publish (Maven Central)	-1s
	24m 7s