Checks are done to ensure that the 'other' event field does not contain an object.

If the 'other' field contains a float which is a whole number (e.g. 90) then the encoding / decoding will result in the number being returned as an integer. When the comparison is done it will fail.

Solution: The comparison does not have to be so strict to catch if objects are being passed. '!=' will suffice.
@see lib/classes/event/base.php line 447