private function _keyExists($propName): bool
	{
		if (array_key_exists($propName, $this->_map)) {
			$propName = $this->_map[$propName];
		}

		return in_array($propName, $this->_publicNames);
	}
private function _keyExists($propName): bool
	{
		if (array_key_exists($propName, $this->_map)) {
			$propName = $this->_map[$propName];
		}

		return in_array($propName, $this->_publicNames);
	}
Returns true if key/prop name exists or is mappable.

@param string $propName

@return bool