whole_func_string: function canExtendProto(obj) {
  	if (!obj) {
  		return false;
  	}
  
  	if (isArray(obj) || isPlainObject(obj)) {
  		return true;
  	}
  
  	return isFunction(obj.constructor) && !isNative.test(obj.constructor.toString());
  }
func_code_string: function canExtendProto(obj) {
  	if (!obj) {
  		return false;
  	}
  
  	if (isArray(obj) || isPlainObject(obj)) {
  		return true;
  	}
  
  	return isFunction(obj.constructor) && !isNative.test(obj.constructor.toString());
  }
func_documentation_string: Returns true if a prototype of the specified object can be extended
  
  @param {?} obj - source object
  @return {boolean}