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use semantic nullable wrapper only #1797

Job	Run time
ci / Check for commonly ignored files	3s
ci / Build website	56s
ci / Lint source files	1m 14s
ci / Check health of package-lock.json file	55s
ci / Measure test coverage	1m 6s
ci / Run fuzzing tests	57s
ci / Run integration tests	1m 42s
ci / Run tests on Node v12	2m 42s
ci / Run tests on Node v14	33s
ci / Run tests on Node v16	54s
ci / Run tests on Node v17	1m 5s
ci / Build 'denoDist' artifact	0s
ci / Build 'npmDist' artifact	0s
Deploy to `npm` branch	0s
Deploy to `deno` branch	0s
	12m 7s

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