</p>

<pre>
func f[P any](x any) int {
	switch x.(type) {
	case P:
		return 0
	case string:
		return 1
	case []P:
		return 2
	case []byte:
		return 3
	default:
		return 4
	}
}

var v1 = f[string]("foo")   // v1 == 0
var v2 = f[byte]([]byte{})  // v2 == 2
</pre>

<p>

    callbacks=callback_router1.routes,
    dependencies=[Depends(dep1)],
    response_class=ResponseLevel1,
)
async def path1_override(level1: str):
    return level1


@app.get("/default1")
async def path1_default(level1: str):
    return level1


@router2_override.get(
    "/override3",
    tags=["path3a", "path3b"],
    responses={
        403: {"description": "Client error level 3"},