Is the sample working as expected?

[arnaud-secondlayer]

I tried the example in https://github.com/google/cassowary.dart/blob/master/example/main.dart .
I'm getting these results:

left: -0.0, right: 100.0
left: -50.0, mid: 0.0, right: 50.0

The first line of results looks ok.
However I don't understand why adding the midpoint Variable would change left to -50, therefore breaking the edgesPositive constraint.

I would have expected.

left: -0.0, mid: 50.0, right: 100.0

Maybe I'm missing something.

[arnaud-secondlayer]

OK, I think by default Variables are set to 0 if suggestValueForVariable is not called.
Now I understand what it happening.