How to use wildcard in --with-using?

[dpaoliello]

The documentation for --with-using says:

A using directive to be included for the given remapped declaration name during binding generation. Supports wildcards.

How do wildcards work with this?
I've tried to use --with-using=*=SomeNamespace, but I don't see the using declaration for SomeNamespace get added.

Looking at the implementation, PInvokeGenerator.WithUsings doesn't set matchStar to true, and even if it did, PInvokeGenerator.TryGetRemappedValue would only match if the remapping was for * not arbitrary wildcards in the name.