si.tex test raises errors under pdflatex?

[dginev]

I'm assuming this is some texlive 2021 regression.

cd t/complex ; pdflatex si.tex

produces a number of "invalid number" errors, with my:

(/usr/local/texlive/2021/texmf-dist/tex/latex/siunitx/siunitx.sty
Package: siunitx 2021-11-03 v3.0.35 A comprehensive (SI) units package

for example

! Package siunitx Error: Invalid number '\pi '.

For immediate help type H <return>.
 ...                                              

l.60 \num{\pi}

unsure what the implications are to the latexml binding yet, but thought I'd record the pdflatex problem already.

[brucemiller]

I have a vague recollection that I did it intentionally, but...

[teepeemm]

I've managed to get si.tex to compile under TeXLive 2023. The easiest is \usepackage{siunitx}[=v2], but if we want to actually use v3:

• we must use \complexnum to parse complex numbers and \numproduct or \qtyproduct to parse products
• for \pi and \odd (or \xi) to be in a \num, we need to declare them as input-digits (see https://tex.stackexchange.com/a/597999/107497)
• prefixes must have units (although you can cheat at this)
• quotients are no longer parsed (to avoid an error, we can add parse-numbers=false, but then the rest of it isn't parsed)

Additionally:

• We should change \si -> \unit and \SI -> \qty
• option changes: group-four-digits -> digit-group-size=4, brackets -> bracket
• column type s has been deleted, but can be redefined
• several SIUnits have been deprecated, but the log file tells you how to define them
• Several options have deleted; the log file will print a warning if you use them

This gets si.tex to compile with pdflatex. Unfortunately, latexml still runs into #2064 (which can be made slightly more minimal with \usepackage{expl3} instead of \usepackage{siunitx}).