32-bit build
It would be nice to have a 32-bit build (i386/armel/armhf).
A cross-compile build would be a first step, but running the testsuite (dh_auto_test) can catch further issues.
For example in C projects the size_t type has different length and can cause problems.
E.g. dovevcot currently fails on 32bit, which would had been nice to know beforehand.