[Suggestion] Define t[[[]]] to index t with a long string

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

I sometimes don't want to escape strings (so that the human reader can 
read them literally instead of trying to figure out the escapes), and 
adding spaces around the long strings just doesn't look as good. t[[[]]] 
is currently a syntax error and t[[===[]===]] is currently a function call.

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