[spec] Validation for exact heap types #13

Job	Run time
build-legacy-exceptions-core-spec	1m 59s
build-web-api-spec	30s
build-legacy-exceptions-js-api-spec	32s
build-spec-versions	13s
build-core-spec	13m 46s
build-code-metadata-spec	2m 32s
build-js-api-spec	33s
ensure-wasm-latest	0s
publish-spec	0s
	20m 5s

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