v4: Golang 1.18 Generics

[hi117]

After reading the code quite a bit, reflection is used all over. It seems like with golang 1.18 coming out with generics, quite a bit of this could be replaced with generics. What areas would be best to replace reflection with generics?

[diamondburned]

Probably none.

Generics can help replace some of the code duplication, such as the discord.[T]Option types. Reflection is only used in AddHandler(v any), and the new additions won't add any type-safety to that.

[diamondburned]

If you can write a prototype of a handler.Handler using generics, I'd be more than happy to consider it. Though I would also want to wait a few months for 1.18 to come out before forcing v3 users to update their Go.

[hi117]

1.18 should be coming out this month, but I understand if you want it to soak for a bit. Also I was thinking adding generics support would be enough to warrant going to v4 as it changes the way you interact with the interface quite a bit.

[diamondburned]

This issue turned out to be more complicated than I thought. I expected [T1 any, T2 interface{ T1 }] to work, but it doesn't: https://go.dev/play/p/4s2dZxnNlEf.