fullQualifiedClassNameFromFile does not keep psr-4 mappings with the same prefix in mind

[Daanooo]

After discovering the issue of our reactors and projectors not being discovered successfully, I found the following:

We have recently restructured some code into old and new src folders. Our path mappings look as follows:

And our event-sourcing.php looks like this:

The reactors and projectors are located in src-old, but could not be discovered because it starts with src. Since the src folder was before the src-old folder, this is the folder it assumed I wanted it to discover, which is the incorrect folder. Changing the order of the mappings to have src-old come first does the trick, but I am interested if this is intended behaviour, or a bug?