apply this to literal object property names and identifiers too.
…r more names separated by a comma to exclude them from compression)
(--max-line-len, default 32K). I've seen both FF and Chrome croak with weird errors when all code was on a single line of 670K (funnily enough, IE didn't complain)
--unsafe to uglifyjs (or call ast_squeeze_more if you're using the JS API).
fully sure about (i.e. might alter code logic)