Stop Token#to_s from modifying word attribute #3
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This made debugging the parser quite a pain, and extracting the original word impossible without trickery.
For the sake of avoiding weird bugs in the future, the token tags shouldn't play around with mutable strings.
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I wrote a scanner on top of chronic, using its tagger, and this was pretty strange. Token#to_s is elongating its word attribute every time I display it, making it hard to query tokens if they've been tagged.
First commit fixes this bug and includes a testcase.
Second commit alters similar mutable-to_s cases throughout the Tag hierarchy to avoid this situation in the future.