Fix failN1 calculation

One bit of the code used `<`, the other `<=`.
We use `<`.
Loader: Refactor node updating

Infix style makes it easier to add more node modifications.
Tests: Fix some flipped ==?

The expected value should be on the right.

Also fixed usage of `il'` when `il` was a free name.
fixup! Fix failN1 calculation
fixup! Fix failN1 calculation
WIP: More rr-htools