[XeTeX] XeTeX release notes ?

Bruno Le Floch blflatex at gmail.com
Sun Nov 3 18:30:55 CET 2019

Note that the version test using \ifdim is unsafe because values are
rounded to a certain number of scaled points before being compared.

On 11/3/19 5:27 PM, Taylor, P wrote:
>                 *\ifdim \XeTeXrevision pt < 0.99999pt*

\ifdim 0.99998pt < 0.99999pt
% expected

gives an "Undefined control sequence ... \UNEXPECTED".  Unfortunately
one needs to parse a bit more carefully the XeTeX revision, or perhaps
simply move the decimal point a bit.

\def\@XeTeX at revision@aux .#1#2{#1#2.}
\ifnum\expandafter\@XeTeX at revision@aux\XeTeXrevision<99.999pt


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