Sorry, thought about it more and I'm raining on your (and dherman's)
parade :-(.
In an expression but not statement context,
... { (x) e; }
is already a valid JS program if e begins with (, [, +, or - (the last
two intended as unary operators but becoming binary).
Note that | bracketing avoids this problem. In no case can JS of any
extant version have a legal sequence {|.
But because {( is already allowed, what comes after the closing ) can be
the continuation of a parenthesized expression.
Even if you don't buy my "better to look different because not function"
argument, this tilts the balance.
/be
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