If I remember well, there is (was ?) some kind of objective for backward
compatibility, namely that all (updates of) versions of all TeX engines should
produce the exact same output for a given input file. The background being that
any TeX file that used to compile correctly in the past should also compile
correctly in the future.
Is my memory correct? And just out of curiosity, does the rule apply to the DVI
/ XDV file? WIth pdflatex, I guess there is no DVI file to compare.
Cheers,Wilfred
On Saturday, February 20, 2016 2:15 PM, Akira Kakuto
<kak...@fuk.kindai.ac.jp> wrote:
> Why is it so? And what generates this difference? The question has been
> lingering on SX for a while
> http://tex.stackexchange.com/questions/292675/why-does-xelatex-produce-different-files-from-the-same-deterministic-sources
> but with no reasonable answer!
I wrote a possible answer on SX.
Best,
Akira
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