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I have a grid with a (json) array as datasource. the fields has names like Asset.Label (is coming from an existing API). Initialy there was a problem with display the data in the columns. To overcome this problem I use a valueAccessor like this:

public valueAccessor(fieldstringdataobjectcolumnobject) {
    return data[field];

The problem is the sorting engine does not look at the returned value of the valueAccessor when sorting that column. When I add a SortComparer like this:

(rc=> {
          return 0;

the r and c are both undefined.