docs: def replaced_url_for(endpoint, filename=None, **values):
      """
      This function acts as "replacement" for the default url_for() and intercepts if it is a request for bower assets
  
      If the file is not available in bower, the result is passed to flasks url_for().
      This is useful - but not recommended - for "overlaying" the static directory (see README.rst).
      """
      lookup_result = overlay_url_for(endpoint, filename, **values)
  
      if lookup_result is not None:
          return lookup_result
  
      return url_for(endpoint, filename=filename, **values)