In the of ExtJs 3.x.x, the find method has the following code:

    find : function(property, value, start, anyMatch, caseSensitive){
        var fn = this.createFilterFn(property, value, anyMatch, caseSensitive);
        return fn ?, null, start) : -1;
The createFilterFn method has a signature of :

createFilterFn : function(property, value, anyMatch, caseSensitive, exactMatch){
If you call the find method without the exact match parameter passed, it defaults to finding any match, which can be problematic if you are looking for a specific record and not just any record(s). By adding the exactMatch parameter to the signature of the find method and the call to createFilterFn, this problem is resolved.