The content of this module is based on the paper
A Type-Based Approach to Divide-And-Conquer Recursion in Coq
by Pedro Abreu, Benjamin Delaware, Alex Hubers, Christa Jenkins,
J. Garret Morris, and Aaron Stump
https://doi.org/10.1145/3571196
The original paper relies on Coq's impredicative Set axiom,
something we don't have access to in Idris 2. We can however
reproduce the results by ignoring the type levels