to_currency (Numeric::Transformer)

    # File lib/merb-helpers/core_ext/numeric.rb, line 220
        def self.to_currency(number, format_name = nil, options = {})

          format = (formats[format_name] || default_format)[:currency].merge(options)

          begin
            format[:format].gsub(/%n/, with_precision(number,
                                          format_name, :precision  => format[:precision]) ).gsub(/%u/, format[:unit])
          rescue
            number
          end
        end