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Returns the count of characters (not bytes) in +self+:
'foo'.length # => 3
'тест'.length # => 4
'こんにちは'.length # => 5
Contrast with String#bytesize:
'foo'.bytesize # => 3
'тест'.bytesize # => 8
'こんにちは'.bytesize # => 15
Related: see {Querying}[rdoc-ref:String@Querying].
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