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simplify extendSchemaImpl with mapSchemaConfig #1819

Job	Run time
ci / Lint source files	1m 4s
ci / Check health of package-lock.json file	18s
ci / Check for commonly ignored files	4s
ci / Run CodeQL security scan	1m 42s
ci / Run fuzzing tests	38s
ci / Run integration tests	1m 34s
ci / Run tests on Node v16	33s
ci / Run tests on Node v18	33s
ci / Build 'denoDist' artifact	27s
ci / Build 'npmDist' artifact	37s
ci / Run tests on Node v19	35s
ci / Build website	1m 6s
Deploy to `deno` branch	0s
Deploy to `npm` branch	0s
	9m 11s

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