protected function getDefaultConvertors()
	{
		$convertors   = [];
		$convertors[] = new BooleanFunctions($this);
		$convertors[] = new BooleanOperators($this);
		$convertors[] = new Comparisons($this);
		$convertors[] = new Core($this);
		$convertors[] = new Math($this);
		if (extension_loaded('mbstring'))
		{
			$convertors[] = new MultiByteStringManipulation($this);
		}
		$convertors[] = new SingleByteStringFunctions($this);
		$convertors[] = new SingleByteStringManipulation($this);

		return $convertors;
	}