⬆️ Bump Typer to 0.20.0 to add command suggestions on typo

[savannahostrowski]

With https://github.com/fastapi/typer/releases/tag/0.20.0, Typer now provides command suggestions on error, meaning we get this UX for free.

[svlandeg]

I think the suggestions in 0.20.0 are great, but do we have to bump here? I'd personally only bump the lower-bound for compatibility reasons. Here, I assume that any new install will simply get Typer 0.20.0 even if we don't bump, so why do we need to enforce it (genuine question)? I just want to be mindful of those users/use-cases that want to stick to an older version of Typer for some reason...

[savannahostrowski]

Good question! My rationale here was that fastapi-cli is an end-user CLI, so I don't really see many realistic scenarios where a bump would cause issues. Even if a user had a super locked-down environment where they've pinned a specific version, they'd still need to update something to get the new CLI version anyway.

From a UX perspective, I'd also argue that suggestions on typos are commonplace in modern CLIs, so it'd be nice if we could ensure a consistent UX for all users. It'd be weird to have the CLI only provide suggestions if the user's deps happened to transitively resolve to 0.20.0, right? By bumping the lower bound, we guarantee everyone gets the same base experience.

[svlandeg]

I see where you're coming from, I'm just unsure whether we need to make that decision for users or not. They might have a pin on Typer in the same env for some other reason. Anyway I don't care strongly either way, just thought it was worth discussing. Will let Tiangolo make the final decision 😉