Can't compile haydari on 0.20.5

[manveru]

Hi there, I'm rather new to Crystal and wanted to use your library. Unfortunately it seems like the language changed a bit, and I'm not that familiar enough with generics to fix it yet.
Can you maybe take a look?

[jeromegn]

I also would like this.

I'm not a maintainer here, but I took a quick look and, unfortunately, it's not such a quick fix.

[umurgdk]

I will try to fix it this weekend