I think this needs to be thought trough by people writing the spec. This is
just
an ad-hoc workaround, which will likely not match whatever is later decided
as
the actual spec.
If you really need to get something in *right now* for whatever reason, I'd
only
sign off on *only* changing runtime-array.cc/IsConcatSpreadable to include:
if (obj->IsJSObject() && !isolate->MayAccess(Handle<JSObject>::cast(obj))) {
// or whatever value is the default non-spreadable value.
return isolate->heap()->false_value();
}
https://codereview.chromium.org/1230793002/
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