Installing this breaks splattributes for Glimmer components in Ember 3.8

[mansona]

I know the title sounds a bit specific 🙈 but this is something that I came across when trying to upgrade the Ember Styleguide without dropping support for Ember 3.8.

I was passing splattributes down into one of our components but for some reason they weren't being applied (good thing there was a test to cover them)

I managed to identify it was this addon that was creating the issue and we removed the dependency for now (and sacrificed being able to use nested angle bracket syntax for the styleguide)

I made a quick recreation showing that just by adding this addon it breaks a test: mansona/attributes-glimmer-reproduction#1

let me know if you have any questions 👍