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JP22: Implementations are discouraged? #186

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satou441 opened this Issue Nov 16, 2015 · 1 comment

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satou441 commented Nov 16, 2015

[JP22] At pp168, 12.5.6.1 Runtime Semantics, NOTE of Evaluation says "Implementation are discouraged from defining ...". What does it mean by "discouraged"? Should it behave as implementation defined, undefined, some error, or something else?

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bterlson Nov 19, 2015

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Notes are non-normative. This is just an editorial note conveying the opinion of TC39 (or the editor) that implementations should not choose to define a new typeof value for exotic objects, but they are free to do so per the previous table.

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bterlson commented Nov 19, 2015

Notes are non-normative. This is just an editorial note conveying the opinion of TC39 (or the editor) that implementations should not choose to define a new typeof value for exotic objects, but they are free to do so per the previous table.

@bterlson bterlson closed this Nov 19, 2015

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