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Returns a copy of +self+ with trailing substring <tt>suffix</tt> removed:
'hello'.delete_suffix('llo') # => "he"
'hello'.delete_suffix('hel') # => "hello"
'тест'.delete_suffix('ст') # => "те"
'こんにちは'.delete_suffix('ちは') # => "こんに"
Related: String#delete_suffix!, String#delete_prefix.
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