The team will shortly be updating the version of l3kernel on CTAN. The
recent work to clearly differentiate 'private' and 'public' material
means that functions which are marked in the LaTeX3 documentation as
'internal' are being renamed. This should in most cases be transparent
to authors, but there are some cases where internal functions have been
used by others.
In particular, we note that \int_eval:w, \int_eval_end:, \dim_eval:w and
\dim_eval_end: are in use in some third-party packages. The CTAN update
will include compatibility code to continue to support these names for 6
It is important to emphasise that internal functions should not be used
outside of the kernel: they are documented as they are used across
kernel modules, not for wider use.