bearing is initial bearing

The implementation of bearing is about the initial bearing as from cited URL in the sources. IMHO this should be explicitly mentioned in the API. Maybe even implement final bearing as per above URL

For final bearing, simply take the initial bearing from the end point to the start point and reverse it (using θ = (θ+180) % 360).

[DenisCarriere]

I think adding an additional param would work.

This picture was helpful figuring out the difference between intial bearing (29 Deg) & final bearing (150 Deg).

Proposed JSDocs

/**
 * Takes two {@link Point|points} and finds the geographic bearing between them.
 *
 * @name bearing
 * @param {Feature<Point>} start starting Point
 * @param {Feature<Point>} end ending Point
 * @param {boolean} [final=false] calculates the final bearing if true
 * @returns {number} bearing in decimal degrees

[DenisCarriere]

We can, since the repo is only 4 lines of code, it might be best to simply use arc as a dependency.