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+Returns the count of bytes (not characters) in +self+:
+
+ 'foo'.bytesize # => 3
+ 'тест'.bytesize # => 8
+ 'こんにちは'.bytesize # => 15
+
+Contrast with String#length:
+
+ 'foo'.length # => 3
+ 'тест'.length # => 4
+ 'こんにちは'.length # => 5