bitboard: use explicit bit representation

src/bitboard.rs

@@ -45,14 +45,14 @@ impl BitBoard {
 
     #[cfg(not(feature = "bitvec"))]
     pub const fn get(&self, row: usize, col: usize) -> bool {
-        ((self.0 >> Self::get_index(row, col)) & 1) != 0
+        ((self.0 >> Self::get_index(row, col)) & 0b1) != 0b0
     }
 
     #[cfg(not(feature = "bitvec"))]
     pub const fn set(&mut self, row: usize, col: usize, value: bool) {
         let index = Self::get_index(row, col);
         // PERF! branchless setting of bit (~+3% perf bump)
-        self.0 &= !(1 << index); // clear bit
+        self.0 &= !(0b1 << index); // clear bit
         self.0 |= (value as BitBoardInner) << index; // set bit (if needed)
     }