Is there room for a compile-time variant of
Partition is an in-place algorithm in Phobos so maybe
Partitioned would be a more suitable name.
As a replacement for patterns such as
import std.meta : Filter, templateNot; alias X = Filter!(isX, Ts); alias UnX = Filter!(templateNot!isX, Ts);
Not sure about the ordering requirement. Probably not of interest in the compile-time case.