code: def convert_key(key)
        case key
          when '$'
            'text'
          when 'D', 'Dm', 'F', 'FDm', 'FNm', 'G', 'Gm', 'Gn', 'H', 'Hm', 'Hn', 'Nm', 'P', 'Pp', 'PPd', 'PPn', 'S', 'T', 'U', 'V', 'W'
            key
          else
            key.to_s.strip.
                gsub('@', '').
                gsub(' ', '_').
                gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
                gsub(/([a-z\d])([A-Z])/,'\1_\2').
                tr("-", "_").
                squeeze("_").
                downcase
        end
      end
docs: Protected: Convert keys to a more rubyesque style (underscroce, lowercase). Excludes keys with specific meanings.
   Overloads the the convert_key Mash method.
  
   key - String, possibly containing CamelCase words and/or dash-es
  
   Examples:
     convert_key("CamelCase") => camel_case
     convert_key("dash-es") => dash_es
  
   Returns String based on lowercase letters and an underscore for separation.