function identical(obj1, obj2) {
        if (obj1 === obj2 || (isNaN(obj1) && isNaN(obj2))) {
            return obj1 !== 0 || isNegZero(obj1) === isNegZero(obj2);
        }
    }
@name samsam.equal
@param Object obj1
@param Object obj2

Returns ``true`` if two objects are strictly equal. Compared to
``===`` there are two exceptions:

  - NaN is considered equal to NaN
  - -0 and +0 are not considered equal