jQuery Grid Plugin - jqGrid

Sorry, but where you get so bad code example!!!??? Please never fill the grid with respect of addRowData. The simplified code which do the same is http://jsfiddle.net/OlegKi/usqgrnau/3/. The problem is that the code of the example is still buggy. It uses

hidden: 'true'

 instead of

hidden: true

It's not the same values. So the demo is buggy and the only problem which I see is that jqGrid generate a little strange looking grid in the case of wrong input data. Nevertheless one can change the code of jqGrid a little to improve the look of results in case of usage wrong type of hidden property of colModel. One can improve the code of jqGrid by replacing the line 

if( ts.p.colModel[j].hidden ) {

to

if (ts.p.colModel[j].hidden === true) {

(like the line of formatCol do) and the line 

if(!ts.p.colModel[i].hidden) {

to 

if (!ts.p.colModel[i].hidden === true) {

Best regards
Oleg