awk doesn't convert strings to zero for $0

Hi. A user reported this to me in relation to some gawk documentation. I'm forwarding the actual issue on: ```sh $ echo foo bar | nawk '{ print $("2foo") }' bar ``` Fine and dandy. But now try this: ```sh $ echo foo | nawk '{ print $("foo") }' nawk: illegal field $(foo), name "foo " input record number 1, file source line number 1 ``` Or even this: ```sh $ echo foo | nawk '{ print $("0foo") }' nawk: illegal field $(0foo), name "0foo " input record number 1, file source line number 1 ```