protected function sanitize($operand)
    {
        if (is_int($operand)) return new IntegerNode($operand);
        if (is_float($operand)) return new NumberNode($operand);

        return $operand;
    }
protected function sanitize($operand)
    {
        if (is_int($operand)) return new IntegerNode($operand);
        if (is_float($operand)) return new NumberNode($operand);

        return $operand;
    }
protected function sanitize ( $ operand ) { if ( is_int ( $ operand ) ) return new IntegerNode ( $ operand ) ; if ( is_float ( $ operand ) ) return new NumberNode ( $ operand ) ; return $ operand ; }
Convert ints and floats to NumberNodes

@param Node|int|float $operand
@retval Node
Convert ints and floats to NumberNodes