Full Unicode Search at 50× ICU Speed with AVX‑512

From a German user perspective, ICU and your fancy library are incorrect, actually. Mass is not a different casing of Maß, they are different characters. Google likely changed this because it didn't do what users wanted.

The confusion likely stems from the relatively new introduction of the capitalized ẞ https://de.wikipedia.org/wiki/Gro%C3%9Fes_%C3%9F

Maß capitalized (used to be) MASS.

Funnily enough, Mass means one liter beer (think Oktoberfest).