.macro behavior

[Jan Beulich]

Is it intentional that .macro

- ignores the (configurable) set of symbol name characters and instead
only allows [[:alpha:]_$][[:alnum:]_$]*
- silently inserts a zero-length named macro if the name starts with
any non-token character
- silently ignores the rest of the line if a formal argument starts
with any non-token character

If not, I'd like to fix this. One major concern here is that with these
restrictions one can't build trivial things like a .bss
pseudo-directive...

Thanks, Jan