    # 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