`append` for maps.

[ske2004]

Title

Edit: This may be not very trivial when keys collide

[ske2004]

I think append(a, b) should have b overwrite a, and to prioritze you can swap

[vtereshkov]

The name append doesn't look right in this case. Maybe a new function like merge? I'm not sure.

Go has offered maps.Copy since 1.18, but it's a type-generic library function:

https://go.dev/play/p/hnaCN1yXHOF

[ske2004]

The name append doesn't look right in this case. Maybe a new function like merge? I'm not sure.

Go has offered maps.Copy since 1.18, but it's a type-generic library function:

https://go.dev/play/p/hnaCN1yXHOF

It makes sense imo, if you're adding right map to left map the right map will override the keys, appending on top