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Returns an array of the characters in +self+:

  'hello'.chars     # => ["h", "e", "l", "l", "o"]
  'тест'.chars      # => ["т", "е", "с", "т"]
  'こんにちは'.chars # => ["こ", "ん", "に", "ち", "は"]
  ''.chars          # => []

Related: see {Converting to Non-String}[rdoc-ref:String@Converting+to+Non--5CString].