Prevent String mutation #64
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We had a bug with frozen Strings. It's not clear that the stripping was also mutating, and it was failing silently on the frozen String. I figure there are basically 2 ways to go here: raise on the frozen String or dup the String.
As I see no reason to expect that this method mutates the String (ie it's not a bang method like the gsub! that actually mutates), the dup method seems appropriate.