function equalObjects(object, other, equalFunc, customizer, bitmask, stack) {
	  var isPartial = bitmask & PARTIAL_COMPARE_FLAG,
	      objProps = keys(object),
	      objLength = objProps.length,
	      othProps = keys(other),
	      othLength = othProps.length;

	  if (objLength != othLength && !isPartial) {
	    return false;
	  }
	  var index = objLength;
	  while (index--) {
	    var key = objProps[index];
	    if (!(isPartial ? key in other : baseHas(other, key))) {
	      return false;
	    }
	  }
	  // Assume cyclic values are equal.
	  var stacked = stack.get(object);
	  if (stacked) {
	    return stacked == other;
	  }
	  var result = true;
	  stack.set(object, other);

	  var skipCtor = isPartial;
	  while (++index < objLength) {
	    key = objProps[index];
	    var objValue = object[key],
	        othValue = other[key];

	    if (customizer) {
	      var compared = isPartial
	        ? customizer(othValue, objValue, key, other, object, stack)
	        : customizer(objValue, othValue, key, object, other, stack);
	    }
	    // Recursively compare objects (susceptible to call stack limits).
	    if (!(compared === undefined
	          ? (objValue === othValue || equalFunc(objValue, othValue, customizer, bitmask, stack))
	          : compared
	        )) {
	      result = false;
	      break;
	    }
	    skipCtor || (skipCtor = key == 'constructor');
	  }
	  if (result && !skipCtor) {
	    var objCtor = object.constructor,
	        othCtor = other.constructor;

	    // Non `Object` object instances with different constructors are not equal.
	    if (objCtor != othCtor &&
	        ('constructor' in object && 'constructor' in other) &&
	        !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
	          typeof othCtor == 'function' && othCtor instanceof othCtor)) {
	      result = false;
	    }
	  }
	  stack['delete'](object);
	  return result;
	}
A specialized version of `baseIsEqualDeep` for objects with support for
partial deep comparisons.

@private
@param {Object} object The object to compare.
@param {Object} other The other object to compare.
@param {Function} equalFunc The function to determine equivalents of values.
@param {Function} customizer The function to customize comparisons.
@param {number} bitmask The bitmask of comparison flags. See `baseIsEqual` for more details.
@param {Object} stack Tracks traversed `object` and `other` objects.
@returns {boolean} Returns `true` if the objects are equivalent, else `false`.