> True, it gets the job done. As you indicate, stylistically it does not
> look particularly nice. I am not claiming the FT variant is perfect
> but at least it is quite clear what it does and clarity of the code is
> important.
Yes, I agree.
> However, I guess it is not particular important to avoid
> reading the arguments twice so we could just drop this FT variant
> completely.
I dunno, any more.
Could even have a command that expands to
#1\use_arg_ii:nn\use_arg_i:nn
or whatever to reverse a regular TF conditional.
I guess we should continue to mull over things but leave it as is for
now...