Suggestion: put this evolving spec into a Gist or something similar. On Jul 28, 2013, at 23:24 , Brendan Eich <bren...@mozilla.com> wrote:
> Brendan Eich wrote: >> Function.setTypeOf(V, U) >> >> 1. Let S = ToString(U) >> 2. Let T = V >> 3. If T is null then >> 3a. If S is not "null" and S is not "object", throw >> 4. Else >> 4a. If T is not a value object constructor, throw >> 4b. T = T.prototype >> 4c. If TypeofToExemplarMap.has(S), throw >> 5. Call TypeofToExemplarMap.set(S, T) >> 6. Call ExemplarToTypeofMap.set(T, S) > > Correction, see new 4b below: > > 1. Let S = ToString(U) > 2. Let T = V > 3. If T is null then > 3a. If S is not "null" and S is not "object", throw > 4. Else > 4a. If T is not a value object constructor, throw > 4b. If T and Function are not same-realm, throw > 4c. T = T.prototype > 4d. If TypeofToExemplarMap.has(S), throw > 5. Call TypeofToExemplarMap.set(S, T) > 6. Call ExemplarToTypeofMap.set(T, S) > > I did not add an exception when the current evaluation context's realm is not > the same as Function's -- that seems too restrictive, forbidding script in > the main window from fixing up typeof for same-origin code that it loads into > an iframe. > > Again, comments welcome (cc'ing Allen since he is realm-master; ES1-5 left > realm implicit and singular, contrary to reality in browsers). > > /be > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org > https://mail.mozilla.org/listinfo/es-discuss > -- Dr. Axel Rauschmayer a...@rauschma.de home: rauschma.de twitter: twitter.com/rauschma blog: 2ality.com
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