Unnoticed colour change with threshold 0

[steffanwilliams]

While comparing latest screenshots to baseline, I expected that the following colour difference would have triggered a test failure, however this still passes:

I have threshold: 0 specified in my config, but I just wanted to check if there still some tolerance being applied when comparing screenshots?

[SeanThompsonUptick]

Tried this today and it only works if the threshold optional parameter is not passed at all. Threshold set to anything causes the test to pass, even when I completely change padding and colour of the element.

[mj-watts]

For me if threshold is 0 then tests will pick up differences but if anything over 0 (0.1, 0.01) tests will pass with even major text changes, so something is broken here.