WARN: .mops/base@0.10.2/src/Principal.mo:80.20-80.32: warning [M0154], field append is deprecated:

Developers
1

If I use the mops package: GitHub - ZhenyaUsenko/motoko-hash-map: Stable hash maps for Motoko
I receive the following warning:

WARN: .mops/base@0.10.2/src/Principal.mo:80.20-80.32: warning [M0154], field append is deprecated:
Array.append copies its arguments and has linear complexity;

My question is how can I get ride of this warning ?