Fix RubyString instances to raise FrozenError exceptions when mutations are attempted in debug mode… #5106
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…ns are attempted in debug mode It was working OK in normal mode but not in debug mode.
nomadium
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String instances were raising FrozenError exceptions as expected since Ruby 2.5, when modifications on frozen instances are attempted but the same was not happening in debug mode (they were raising RuntimeError, the expected behavior until 2.4).
This should fix a lot of failures in ruby-2.5 branch.
/cc: #4876