CFG strength schedule (and other parameters?) veer off from expected values due to float inconsistencies

[optisynapsis]

I've been using Deforum for simple frame interpolation animations.
When I set a CFG schedule, it seems the value veers off the exact amount (i.e 1.09999999 instead of 1.0, 1.5454545454 instead of 1.5).
I have set the strength schedule to 0: (1) to be sure that wasn't the issue.

1. Set up an interpolation render, set steps to 5 and CFG scale schedule from 0: (2), 4: (4)
2. Generate
3. The values of the CFG scale each frame will deviate from the expected 2, 2.5, 3, 3.5, 4

Any idea what's causing this, and if a 'homebrew' mod could solve it?