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This is an initial implementation which could probably use a little more testing. Additionally, any feedback on names and interfaces would be welcome.
Note that I added the lock on the context because it's the only way to guarantee that you can add a value to the context without races, but I'd be open to other options.
Closes #7.
This is also meant as a precursor for #79 since I think the default should not allow a subsystem request to go through.