that `has:()=>true` breaks with features detections that are meant to be
less obtrusive than getters ... i.e. `'geolocation' in navigator` or
`'innerHTML' in genericNode` and all others that are not supposed to pass
through a potentially expensive getter to retrieve a feature detection
purpose info.
Long story short that NoSuchProperty is obtrusive in an upside-down way ...
I personally would not use that and would not expect that anywhere
The 'has' handler is required to work around a Firefox limitation. A
compliant ES6 implementation only needs the 'get' handler.
Related bug reports:
https://bugzilla.mozilla.org/show_bug.cgi?id=914314
https://bugzilla.mozilla.org/show_bug.cgi?id=1009199
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