First Check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue 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.
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Commit to Help

• I commit to help with one of those options 👆

Example Code

from __future__ import annotations

import typer

app = typer.Typer()


def main():
    app()


@app.command()
def test(flag: bool | None = typer.Option(None, "--flag", "-f", help="A flag")):
    print(flag)


if __name__ == "__main__":
    main()

Description

1. Run the example code
2. See the error: https://sourceb.in/SxyHEeLZxf

Operating System

Linux

Operating System Details

No response

Typer Version

0.4.0

Python Version

Python 3.8.10

Additional Context

No response