[Groff] Re: .substring bug - indicies don't work as documented(?)

[Werner LEMBERG]

> Languages seem to do it all kinds of ways.
>
>     % python
>     >>> s = 'abcdefg'
>     >>> s[1]
>     'b'
>     >>> s[1:1]
>     ''
>     >>> s[1:2]
>     'b'
>     >>> s[0:2]
>     'ab'
>     >>> s[-2]
>     'f'
>     >>> s[-2:]
>     'fg'

Emacs Lisp's `substring' command behaves identically.  I'm more and
more convinced that it is a good idea to make groff's .substring
request work similar.

While this is an incompatible change, it is an improvement IMHO.  Any
objections?


    Werner