#{foo bar baz} is somewhat ugly. It occurs to me that one could modify
the reader to additionally accept
{{foo bar baz}}
without breaking anything. It's not possible for it to be a valid map
literal, because the outer {...} pair has only one object inside it
and a map literal requires an even number of objects (zero, two, four
...), so right now {{foo bar baz}} will just throw a
CompilerException, and so will {{foo bar baz quux}} even though the
inner {...} pair then has an even number of objects. Making the reader
treat that as a set literal is therefore a purely additive change.
It's one character longer than #{foo bar baz} but it looks nicer, IMO,
and still shows the cousin-ship between sets and maps by using the
same choice among {}, [], ().
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