With https://github.com/MicroHs/indexed-traversable-mhs, all of our dependencies compile with [MicroHs](https://github.com/augustss/MicroHs), so I'd like to make `pqueue` support MicroHs as well.
With https://github.com/MicroHs/indexed-traversable-mhs, all of our dependencies compile with MicroHs, so I'd like to make
pqueuesupport MicroHs as well.