In commit <https://github.com/latex3/svn-mirror/commit/7012a7e>, Joseph
Wright wrought:
> In general, the team encourage the use of descriptive names in \LaTeX3 code.
> Thus many helper functions will have names which describe briefly what they do,
> rather than simply indicating that they are auxiliary to some higher-level
> function. However, there are places where one or more \texttt{aux} functions
> are required. Where possible, these should be differentiated by signature
> \begin{verbatim}
> \cs_new_protected:Npn \@@_function:nn #1#2
> {
> ...
> }
> \cs_new_protected:Npn \@@_function_aux:nn #1#2
> {
> ...
> }
> \cs_new_protected:Npn \@@_function_aux:w #1#2 \q_stop
> {
> ...
> }
> \end{verbatim}
The use of `\@@_function:nn` implies that the initial function is itself
an internal one. Sometime that will be the case, of course, but I think
`\pkg_function:nn` would make a better primary.
(Thinking aloud: Unless the intention is that `\pkg_function:nn` is the
primary and `\@@_function:nn` ==> `\__pkg_function:nn` is the first
auxiliary? but then you'd have said that.)
--Joel