platex-dev uses the e-uptex engine

[Ulrike Fischer]

Am Wed, 31 May 2023 06:58:30 +0900 schrieb Hironobu Yamashita:

> Hi - that's intended: I'm planning to switch platex to euptex
> when current LaTeX2e development version goes to master.
> Current status of platex-dev is the best approximation of it.

Ah. 

As \forcecjktoken is now defined hyperref no longer forces
unicode=false and the bxjsbook class  errors in platex-dev:

https://github.com/latex3/hyperref/issues/283


What is needed here? Is unicode=true ok for the new platex and
should the class adapt?

Ulrike