Black formats union arguments with default call value weirdly

[zmievsa]

Examples in the current Black style

def some_fastapi_route(
    some_header: str
    | None = Header(
        None,
        some_helpful_description="Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn",
    ),
):
    ...

Desired style

def some_fastapi_route(
    some_header: str | None = Header(
        None,
        some_helpful_description="Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn",
    ),
):
    ...

Additional context

Here's how black formats the same snippet without the new Union syntax:

def some_fastapi_route(
    some_header: Optional[str] = Header(
        None,
        some_helpful_description="Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn",
    ),
):
    ...

[ichard26]

Hey thanks for filing a style issue! I appreciate the feedback, but this is mostly a duplicate of #2316 so I'll be closing this in favour of that.