[BioRuby] bio/alignment extract_seq question

[Trevor Wennblom]

in 'bio/alignment.rb':

###
    def self.extract_seq(s)
      seq = nil
      if seq.is_a?(Bio::Sequence) then
        seq = s
      else
        for m in [ :seq, :naseq, :aaseq ]
          begin
            seq = s.send(m)
          rescue NameError, ArgumentError
            seq = nil
          end
          break if seq
        end
        seq = s unless seq
      end
      seq
    end
###

Should 'seq.is_a?' be 's.is_a?'