Mark S. Miller wrote: > If a property is _configurable_, it may be deleted, its enumerability > may be changed, it may be changed between being a data property (with > [[Value]] and [[Writable]]) and an accessor property (with [[Getter]] > and [[Setter]]), and it may be made non-configurable, at which point > none of these changes remain possible. As an unfortunate implication > of legacy issues, a non-configurable writable data property may be > made non-writable. If it weren't for this special case, we'd have to > split deletable from configurable.
I don't see why any special case is needed here, or why removing it would require splitting [[Deletable]] from [[Configurable]]. Suppose that [[Configurable]] = false prevents a writable data property from being deleted or changed to non-writable. What compatibility problem does this introduce? ES3 had no way for user code to change attributes, so I don't see how there can be a compatibility problem. -- David-Sarah Hopwood _______________________________________________ Es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
