How to handle floating point comparison warnings (DO NOT MERGE)

There are quite a few of these. I've looked at most of them and they are legitimate == 0.0 comparisons when the float was directly set to 0.0. One way to handle them is to turn off -Wno-float-equal. Another is using the mechanism in this pull (or something similar). Looking for comments on what direction to head.
Another one where using FLT_EPSILON would seem to be too small.