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Re:/I Considered Harmful by pentestercrab on Wednesday March 25, 2020 @09:19PM (#22690044)
On the topic of case and unicode, it's also important to remember that, somewhat surprisingly, the number of characters can change when a change in case occurs:

  $ irb
  >> puts RUBY_VERSION
  2.6.5
  >> "ß".chars.size
  => 1
  >> "ß".upcase.chars.size
  => 2
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