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Returns an array of the codepoints in +self+;
each codepoint is the integer value for a character:
'hello'.codepoints # => [104, 101, 108, 108, 111]
'こんにちは'.codepoints # => [12371, 12435, 12395, 12385, 12399]
''.codepoints # => []
Related: see {Converting to Non-String}[rdoc-ref:String@Converting+to+Non--5CString].
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