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binary guard: extract isBinaryContent helper, apply to @file and proj… #50

Job	Run time
build (macos-latest, 3code-macos-universal, tar.gz)	4m 6s
build (windows-latest, 3code-windows-amd64, zip)	1m 33s
build (ubuntu-22.04, 3code-linux-amd64, tar.gz)	50s
build (ubuntu-22.04-arm, 3code-linux-arm64, tar.gz)	6m 54s
pages	11s
release	-1s
	13m 33s