On Oct 26, 2014, at 8:38 PM, Brendan Eich wrote: > Boris Zbarsky wrote: >> If this is how Records work, it would be good to spell that out explicitly. > > Mutable records have reference, not value, semantics -- good point. > > Some might object to calling any such spec-internal device a "record". This > use of spec-internal reference-semantics mutable "record" could be awkward in > a future edition: > > https://github.com/sebmarkbage/ecmascript-immutable-data-structures
But that is describing language level types, not spec. devices. they would not directly map to the List/Record specification types. > > Does the spec anywhere else need reference semantics for its internal list > and record types? Yes, all over the place. The spec. explicitly makes copies when it doesn't want shared references. Allen
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