| Age | Commit message (Collapse) | Author |
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We have added internal convenience method `__to_str` which
does string type check.
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`"a".sub!("a", "a")` should not return `nil`.
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`FrozenError` is a subclass of `RuntimeError` which used to be
raised. [Ruby2.5]
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This implementation is compatible with CRuby's String#gsub/sub
except \1 ... \9 and \+. They are useless without Regexp library.
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