# File lib/stella/core_ext.rb, line 203
      def in_seconds(u=nil)
        case u.to_s
        when /\A(y)|(years?)\z/
          years
        when /\A(w)|(weeks?)\z/
          weeks
        when /\A(d)|(days?)\z/
          days
        when /\A(h)|(hours?)\z/
          hours
        when /\A(m)|(minutes?)\z/
          minutes
        when /\A(ms)|(milliseconds?)\z/
          milliseconds
        when /\A(us)|(microseconds?)|(μs)\z/
          microseconds
        else
          self
        end
      end