Implement `$has_nulls()` #3387

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2 errors and 6 warnings

No such keg: /opt/homebrew/Cellar/r

pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK is set: not checking for outdated dependents or dependents with broken linkage!

qpdf 11.9.0 is already installed and up-to-date. To reinstall 11.9.0, run: brew reinstall qpdf

pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

checkbashisms 2.23.7 is already installed and up-to-date. To reinstall 2.23.7, run: brew reinstall checkbashisms

ghostscript 10.03.1 is already installed and up-to-date. To reinstall 10.03.1, run: brew reinstall ghostscript