Object.defineProperty lets one change the Writeable attribute with:
Object.defineProperty(obj, prop, ({writeable:state}))
The way that's currently defined, we just convert that one-property
object to a property descriptor and pass it to [[DefineOwnProperty]].
It's a nice way to change a single attribute; the rationale paper[0]
talks about this. If property descriptors couldn't omit the other
fields, how would this work?
That is, of course it can be made to work; one does a
getOwnPropertyDescriptor, modifies the field, and then writes it back.
But what I wrote above is pretty sweet.
[0] Proposed ECMAScript 3.1 Static Object Functions: Use Cases and
Rationale, linked to from
http://wiki.ecmascript.org/doku.php?id=es3.1:es3.1_proposal_working_draft_______________________________________________
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