This is exactly the same as upstream 10.0.1 (released on 2019-07-03), but with a critical fix for exheader replacement and support for BPS patches.
Will upstream once this has received enough testing Update (April 2020): Both PRs have now been merged upstream. However, you should still use the provided boot.firm build or a nightly/hourly build, until a new release of Luma3DS that includes the new features is made.
Code has been halved compared to older releases, which means this only adds roughly ~1KiB of code. Tested on several New 3DS consoles and also on o3DS.