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feat: expose leading comments via getLeadingComments() #1226

Job	Run time
Gradle Check (windows-latest)	4m 41s
Gradle Check (macos-latest)	3m 55s
Grammar Choice Conflicts	23s
Gradle Check (ubuntu-latest)	3m 58s
Maven Verify (ubuntu-latest)	4m 38s
Maven Verify (macos-latest)	5m 54s
Maven Verify (windows-latest)	5m 51s
Gradle Publish (Maven Central)	0s
Build & Deploy Sphinx Docs	0s
	29m 20s