I wanted to swap out the implementation of one of the functions based on other logic (to implement _shape= support in Datasette) - but asyncinject currently uses fn.__name__ introspection, which makes this hard to do.

Would be useful if you could optionally do this instead:

registry = Registry.from_dict({
    "both": both,
    "one": one,
    "two": two,
)

Using .from_dict() here so as not to have the Registry() constructor behave differently for different types of input.