NuShell is also attempting this. Both are cross platform.

https://github.com/nushell/nushell

Thanks for mentioning this! It looks super interesting, but I hadn't heard of it before.

That's right. I recently wrote on this topic: https://jmmv.dev/2020/10/powershell-cmdlet-params.html

Yep. Not perfect... type systems have come a long way since PowerShell did it. But it's a good start.

Look at stuff like PowerShell secure strings for an example of the sort of neat stuff you can do.