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fix: allow sample and extend as unquoted identifiers #1299

Job	Run time
Gradle Check (ubuntu-latest)	36s
Grammar Choice Conflicts	29s
Gradle Check (windows-latest)	52s
Gradle Check (macos-latest)	44s
Gradle Publish (Maven Central)	0s
Build & Deploy Sphinx Docs	0s
Maven Verify (${{ matrix.os }})	0s
	2m 41s