Bruno Le Floch

Perhaps we could have a variable storing expected errors and accepting the validation as successful if the validator gives the expected list of errors? (Does the ctan validator list all...

There are some similar (docstripped-out) lines in `l3regex` (search `trace`) that are completely unused now. Perhaps to keep code readable it would make sense to keep the tracing code outside...

See recent commits (I forgot to point here from them). For practice, I'll try to use in `l3regex` the `\__debug_patch:nnNw` function I've now added.

I thought that l3build merged lines that reach the limit with the next line. Isn't that the case?

Maybe replace \setbox\@mpfootins\box\voidb@x in Phelype's code by \setbox\mybox\box\@mpfootins (with a better name for the box than \mybox, of course) and in the \end{minipage} code do \global\setbox\@mpfootins\box\mybox

I had made some attempt at organizing things in a project at https://github.com/latex3/latex3/projects/2

The main use case is not for internal manipulation of data, but rather for "user" interface. For instance we have ``` \int_case:nn { 123 } { { 0 } {...

Sure, internally you may want to turn the input into a list of pairs `{ {val_1}{code_1} } ...... { {val_n}{code_n} }`, but how do you transform the user input into...

This requires thought about the choice of algorithm: ideally it should be - stable (does not change the order of uncomparable elements such as NaN, only relevant for `fparray`), -...

> The easiest way out would be to check whether the base form is defined. We cannot do that because the package does not need to be loaded. Could we...