Change #..., disallow #{}, add ...[]

["Soni L." <fakedme@...>]

First of all #{} makes no sense, either you know the size or you should 
be using select('#') instead. Second it'd be a lot more useful if #... 
meant the same as select('#', ...). Third if we do get this we can still 
do #({}), which should discourage such usage. Fourth ...[n] could mean 
the same as select(n, ...) (but with an opcode instead of a function, so 
that it's slightly faster).

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