This is not supported because the grammar does not allow NUMBER token to be used at that position. I think we return the NUMBER token with the radix of the integer that it has as value (have to check), if so, it is easy to allow it, and turn in back to a String in the grammar. (I.e. the hostmatch is always a string). (The radix is important if someone does something like node 034.0xff.32.4). We need to check negative numbers too perhaps??).