On precision
Introduction
In a type 2 script, the process is an iterative one with several exchanges between the electric and the thermal problem.
At each iteration (i.e. for each exchange) Flux evaluates a certain precision of the exchanged values.
Definition
The precision calculated in Flux is the difference between the previous and the current value.
During the first exchange it is worth 1 (in the absence of the preceding values).
If the values are the same, it is worth 0.
Utilization
This precision allows defining a stop criterion of the iterative process.