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instance method
String#isutf8
String#isutf8 => true or false
ext/nkf/lib/kconv.rb
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# File tmp/rubies/ruby-3.1.3/ext/nkf/lib/kconv.rb, line 282
def isutf8; Kconv.isutf8(self) end
Returns whether self‘s encoding is UTF-8 or not.