-casts << {:long=>'scaffold', :short=>'s', :type=>'flag', :mandatory=>false, :default=>nil, :allowed=>nil, :disallowed=>nil}
-casts << {:long=>'kmer_min', :short=>'k', :type=>'uint', :mandatory=>false, :default=>25, :allowed=>nil, :disallowed=>nil}
-casts << {:long=>'kmer_max', :short=>'K', :type=>'uint', :mandatory=>false, :default=>50, :allowed=>nil, :disallowed=>nil}
+casts << {:long=>'kmer_min', :short=>'k', :type=>'uint', :mandatory=>false, :default=>20, :allowed=>nil, :disallowed=>nil}
+casts << {:long=>'kmer_max', :short=>'K', :type=>'uint', :mandatory=>false, :default=>100, :allowed=>nil, :disallowed=>nil}