Allow for Type Unions for Lists (RuntimeError: Type not yet supported: int | str)

[fordmcdonald]

First Check

• I added a very descriptive title here.
• I used the GitHub search to find a similar question and didn't find it.
• I searched the Typer documentation, with the integrated search.
• I already searched in Google "How to X in Typer" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• I already checked if it is not related to Typer but to Click.

Commit to Help

• I commit to help with one of those options 👆

Example Code

skipseq: List[int | str] = typer.Option(
        [],
        "-s",
        "--skipseq",
        help="Exclude this sequence, can be specified multiple times",
    )

Description

When outlining parameters of type List, they should support the type unions allowed by Python. A list can contain multiple types; therefore, Typer should allow for this behavior, as well.

Operating System

macOS

Operating System Details

No response

Typer Version

0.6.1

Python Version

Python 3.10.12

Additional Context

No response

[ambroisie]

It's especially troubling for <type> | None, which is not supported when Optional[<type>] is.

[ambroisie]

This is tracked in #533.