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Returns the count of bytes in +self+.
Note that the byte count may be different from the character count (returned by #size):
s = 'foo'
s.bytesize # => 3
s.size # => 3
s = 'тест'
s.bytesize # => 8
s.size # => 4
s = 'こんにちは'
s.bytesize # => 15
s.size # => 5
Related: see {Querying}[rdoc-ref:String@Querying].
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