I'd like to be able to do the following:

async def one():
    return 1

async def two():
    return 2

registry = Registry(one, two)

async def three(one, two):
    return one + two

result = await registry.resolve(three)

Note that three has not been registered with the registry - but it still has its parameters inspected and used to resolve the dependencies.

This would be useful for Datasette, where I want plugins to be able to interact with predefined registries without needing to worry about picking a name for their function that doesn't clash with a name that has been registered by another plugin.