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Scope of ECMA-402 for adding properties to 262

https://github.com/tc39/proposal-temporal/issues/2169

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ECMA-262: Conformance�“a conforming implementation of ECMAScript may provide properties not described in this specification, and values for those properties, for objects that are described in this specification.”

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ECMA-402: API Overview�“This specification introduces new language values observable to ECMAScript code (such as the value of a [[FallbackSymbol]] internal slot and the set of values transitively reachable from %Intl% by property access), and also refines the definition of some functions specified in ECMA-262”

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Is ECMA-402 allowed to extend ECMA-262 prototypes?

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