Mark S. Miller wrote: > 2009/2/10 Allen Wirfs-Brock <allen.wirfs-br...@microsoft.com> >> #2 Why allow "Object" for host objects that are required to conform to the >> section 15.3 specification for Object. If they are distinguishable from >> section 15.3 objects they should have [[Class]]=="Object". An >> implementation can use "HostObject" or something else. (Counter-argument: >> Might confuse some programmers??? (seems weak)) > > I like your #2 direction a lot. If it were feasible to require that host > objects not even use [[Class]] "Object", I'd be in favor. However, I'm > guessing that would differ too greatly from current browser behavior to have > a chance.
Remember that, apart from algorithms that check whether [[Class]] is "Function", "Date" or "RegExp", the only other observable effect of [[Class]] is on the *default* implementation of toString(). A host object can override toString() anyway. A *reliable* way of distinguishing native from host objects, say an Object.isNativeObject(o) method, might actually be useful for secure subset runtimes, but one that can be overridden is not. -- David-Sarah Hopwood ⚥ _______________________________________________ Es-discuss mailing list Es-discuss@mozilla.org https://mail.mozilla.org/listinfo/es-discuss
