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  require 'mustermann'
  prefix ="/:prefix")
  about  = prefix + "/about"
  about.params("/main/about") # => {"prefix" => "main"}

Creates a concatenated pattern by combingin self with the other pattern supplied.
Patterns of different types can be mixed. The availability of `to_templates` and
`expand` depends on the patterns being concatenated.

String input is treated as identity pattern.

@param [Mustermann::Pattern, String] other pattern to be appended
@return [Mustermann::Pattern] concatenated pattern
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