On 15/05/2011 22:35, Bruno Le Floch wrote:
> Proposal: to ban trailing optional arguments entirely.

At a pure LaTeX3 level, I think we may move in that direction to some
extent (although I think \item[...] is a good example where there is
simple alternative). Frank has pointed out that at this stage we want to
keep the user syntax for LaTeX3 'open', but I always point out that
'something like LaTeX2e but more organised' is a likelihood. To me, that
means

  \foo[...]{...}

is a possible, but I'd hope not

  \foo{...}[...]

(i.e. I'm in favour a a single optional argument, which should come
first, at least as a standard approach.)
-- 
Joseph Wright