License Hazard (GPL-3.0)

[joshka]

Notmuch is licensed as GPL-3 / CC-BY-SA, which has a viral effect on anything which uses it
The Notmuch crate is licensed as GPL-3, which has a similar effect.

Currently these libs are MIT licensed (which is great), but due to the inclusion of notmuch, they have the effect of being GPL licensed (which is less good).

I suspect there's no easy way around this other than to remove notmuch. Perhaps a change in architecture would allow the notmuch support to be included as a library that depends on the core types rather than the core types depending on notmuch.