Do not make shared strings for extracted ranges#84
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The issue arises when the `StringScanner` string is being modified while being scanned. In such a case, that string's buffers will be improperly shared, forcing a new buffer to be created each time it is modified. Meanwhile the ever-growing buffers are held in memory by the improperly shared return values. This was fixed by ruby/strscan#84 and strscan is updated in this PR.
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Fixes #83