We had this in ES4, together with the provision that you could have multiple
arguments between the [], so you could define data structures that can be
addressed as:
matrix2d[x, y]
As in here, this would default to the ES5 semantics on objects that don't have
the new [] proxy handler.
Overall, I like it. You're already familiar with the main issues that this
brings up, such as usage cases where folks want a reliable way of indirectly
accessing . properties without hitting the [] proxy. A method call syntax for
that would be fine.
Waldemar
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