remove num crate

src/repr/coords.rs

@@ -1,6 +1,5 @@
 use super::Board;
 use allocative::Allocative;
-use num::Integer;
 use static_assertions::const_assert;
 
 /// PERF! having `Coord` be of type `u8` (instead of usize) increases
@@ -22,8 +21,8 @@ impl CoordPair {
     }
 
     #[allow(clippy::wrong_self_convention)]
-    fn into_indexes(&self) -> (CoordAxis, CoordAxis) {
-        self.0.div_mod_floor(&Board::SIZE)
+    pub const fn into_indexes(&self) -> (CoordAxis, CoordAxis) {
+        (self.0 / Board::SIZE, self.0 % Board::SIZE)
     }
 
     pub const fn area(pos: CoordAxis) -> Self {