Gleam doesn't have auto currying! Often folks find this (currying) a bit confusing to wrap their head around when learning functional programming and we don't feel like it really affords you much that couldn't already be achieved with just a little bit more work by the programmer.

Applicative builder APIs are the only thing we've found would be much much better if we had auto currying.

Ah my mistake. So this is a deviation from Elm?

I think you are confusing Gleam with Gren (a fork of Elm)?