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