What are the available condition constants under uiGridConstants.filter?
<p>Did I miss the link that documents ALL the available uiGridConstants for uiGrid fields in one place?  I was working on columnDefs filter and found out EQUAL does not work.  That's when I realized there is no central documentation for all the condition constants for uiGridConstants.  </p>

<pre><code>columnDefs:
 [ {   }
    , { field: '_pointXID', filter
        : {
            condition: uiGridConstants.filter.CONTAINS, placeholder: '%PATTERN%'
        }, headerCellClass: $scope.whatfilter}
    , { field: '_statU16', width: "5%", filter
        : {
            condition: uiGridConstants.filter.EQUAL, placeholder: '=='
        }, headerCellClass: $scope.whatfilter}
    , { field: '_valDoub', width: "5%", enableFiltering: false }

 ]
</code></pre>

<p>EQUAL's not one of them, and heck how do I know?!</p>