Used by `_.defaults` to customize its `_.assignIn` use.

@private
@param {*} objValue The destination value.
@param {*} srcValue The source value.
@param {string} key The key of the property to assign.
@param {Object} object The parent object of `objValue`.
@returns {*} Returns the value to assign.
function assignInDefaults(objValue, srcValue, key, object) {
	  if (objValue === undefined ||
	      (eq$3(objValue, objectProto$7[key]) && !hasOwnProperty$6.call(object, key))) {
	    return srcValue;
	  }
	  return objValue;
	}