github.com/kaptinlin/jsonschema@v0.4.6/testdata/JSON-Schema-Test-Suite/tests/draft2019-09/optional (about) anchor.json bignum.json cross-draft.json dependencies-compatibility.json ecmascript-regex.json float-overflow.json format id.json no-schema.json non-bmp-regex.json refOfUnknownKeyword.json unknownKeyword.json