Apfloat is split into several modules. One of them is a wrapper for jscience.

Nor jscience nor its dependency, javolution, are currently in Debian, although
there were packaging attempts (to date, libjavolution-java is indeed
ready). Yet, the last released version of jscience (4.3.1) depends on an old
version of javolution (which is now 6.0.0), and there has been many non
backward-compatible ABI changes between the last releases of javolution.
For this reason, we cannot currently package libjscience-java.

Yet, I have written to upstream developer Mikko Tommila and we came to the
conclusion that the apfloat-jscience module can be deactivated. It is
independent of the remaining of the package.
If a new version of jscience is released in the future, there might be worse
trying to package it and activating apfloat-jscience again.

 -- Pierre Gruet <pgt@debian.org>  Sun, 26 July 2020 13:44:30 +0200
