Now when XI is open sourced it'd be useful to install also XI source (not only mono sources) so anyone can debug installed XI.
Fix landed in master/d7a9bd462a02ca5251af308dd260ab63de4e28f8 and cycle9/2bcf787f0545d985d84c74c9c98cd7a55bd69d91
Uh, sorry I confused when I did that comment, I'm working on it. Sorry.
PR Present for the fix on https://github.com/xamarin/xamarin-macios/pull/1663 but we might want to wait until https://github.com/xamarin/xamarin-macios/pull/1872 when we move to pdbs.
FYI I'm back on this since https://github.com/xamarin/xamarin-macios/pull/1872 was merged.
Fixed in PR: https://github.com/xamarin/xamarin-macios/pull/1663
Users, if they have enabled the stepping into the framework, are able to step into both the Xamarin code and the mono code. All src files can be found under /Library/Frameworks/Xamarin.iOS/Versions/Current/src after the new packages are used.