In particular, the binary mode is gone in this commit: https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=fdb7d390dd0d96e4a8239c46f3aa64598b90842b
I've made some updates for man-pages-4.05, and posted a request for review to the list.
Page reviewed by Adhemerval, who thinks it's fine. So, closing this bug.