The
>
new register allocation code has the correct upper range for each of
classic tex, etex, xetex and luatex, but is different to the etex.sty code.
>
> ? Should I make an update removing a few things (or everything)? Can
> the LaTeX update and this code coexist?
They can co-exist in that if you load etex.sty we checked that it
cleanly overwrites everything and so did what it always did.
that would mean you lose the float allocation mechanism.
>
> Thank you,
>
So at some point you probably want to not load etex.sty and not make
those fixes if you detect a new format, but it is not critical that
happens day one of a latex release.