AHHA! Thank you so much for reporting this. Turns out it's a subtle git side-effect of two things - using multiple branches, and me being an idiot.
I've published 13.0.1.7, which FINALLY fixes the signature issue, and also allows you to remove the module, too.
As I said, it's in very early beta
EDIT ARGH NO IT'S STILL THERE, WHAT THE SMEG.
RIGHT! In other news, I really should remember what .gitignore does, and not use it to help me be lazy. Properly fixed in 13.0.1.8. Sorry about that.