I'd be most interested in seeing if we can remove IsConstructor entirely (except
for uses where it's just a guard, implementing the semantics of `new` via
IsConstructor -> [[Construct]] or throw).
It seems like there's at least some movement toward removing it from `Array.of`
and `Array.from`. All that remains is its use to preserve the
`arrayInstance.constructor = undefined` backward-compatibility possibilities.
My preference would be to see if we can get away with breaking that use case,
and reintroduce it if that turns out not to be web-compatible.
The [[Realm]] check in Array.prototype.* is even more annoying than the
IsConstructor guard, but unfortunately required for web-compatibility
per [1]. :-(
[1] http://esdiscuss.org/topic/array-prototype-slice-web-compat-issue
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