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+Returns a copy of +self+ with leading substring +prefix+ removed:
+
+ 'oof'.delete_prefix('o') # => "of"
+ 'oof'.delete_prefix('oo') # => "f"
+ 'oof'.delete_prefix('oof') # => ""
+ 'oof'.delete_prefix('x') # => "oof"
+ 'こんにちは'.delete_prefix('こん') # => "にちは"
+
+Related: see {Converting to New String}[rdoc-ref:String@Converting+to+New+String].