This project is licensed under the MIT License.
This project includes the priority-queue
crate, which is dual-licensed under LGPLv3 and MPLv2.
You can find the source code of that project here: https://github.com/garro95/priority-queue.
We can include the project in our project, since the MPLv2 allows that: https://www.mozilla.org/en-US/MPL/2.0/FAQ/