Thanks for your pull request to Laravel!

Unfortunately, I'm going to delay merging this code for now. To preserve our ability to adequately maintain the framework, we need to be very careful regarding the amount of code we include.

If applicable, please consider releasing your code as a package so that the community can still take advantage of your contributions!

This stuff doesn't really need to go to master.
— Taylor Otwell

master's my better safe than sorry here 😅
— @shaedrich

If you want to separately PR a simple Day enum go for it. I don't see why it couldn't go to 11.x.
— Taylor Otwell

Can't say, I'm surprised …