diff --git a/bitboard/src/bitboard.rs b/bitboard/src/bitboard.rs
index 2453cce..66a5336 100644
--- a/bitboard/src/bitboard.rs
+++ b/bitboard/src/bitboard.rs
@@ -18,8 +18,8 @@ macro_rules! moves_getter {
 }
 
 impl BitBoard {
-    pub const EMPTY: BitBoard = BitBoard(0);
-    pub const FULL: BitBoard = BitBoard(0xFFFFFFFFFFFFFFFF);
+    pub const EMPTY: BitBoard = BitBoard(u64::MIN);
+    pub const FULL: BitBoard = BitBoard(u64::MAX);
 
     pub const fn empty() -> BitBoard {
         BitBoard(0)
@@ -104,6 +104,17 @@ impl BitBoard {
         *self &= !sq_bb
     }
 
+    /// Returns `true` if this BitBoard represents a single square.
+    ///
+    /// ## Examples
+    ///
+    /// ```
+    /// use chessfriend_bitboard::BitBoard;
+    /// assert!(!BitBoard::EMPTY.is_single_square(), "Empty bitboards represent no squares");
+    /// assert!(!BitBoard::FULL.is_single_square(), "Full bitboards represent all the squares");
+    /// assert!(!BitBoard::new(0b010011110101101100).is_single_square(), "This bitboard represents a bunch of squares");
+    /// assert!(BitBoard::new(0b10000000000000).is_single_square());
+    /// ```
     pub fn is_single_square(&self) -> bool {
         self.0.is_power_of_two()
     }
@@ -149,7 +160,7 @@ impl Default for BitBoard {
 
 impl From<Square> for BitBoard {
     fn from(value: Square) -> Self {
-        BitBoard(1 << value as u64)
+        BitBoard(1u64 << value as u32)
     }
 }
 
diff --git a/bitboard/src/library.rs b/bitboard/src/library.rs
index afc4240..5e74259 100644
--- a/bitboard/src/library.rs
+++ b/bitboard/src/library.rs
@@ -4,7 +4,7 @@ use crate::BitBoard;
 use chessfriend_core::{Color, Direction, Square};
 use std::sync::OnceLock;
 
-pub(super) const RANKS: [BitBoard; 8] = [
+pub(crate) const RANKS: [BitBoard; 8] = [
     BitBoard(0xFF << 0 * 8),
     BitBoard(0xFF << 1 * 8),
     BitBoard(0xFF << 2 * 8),
@@ -15,7 +15,7 @@ pub(super) const RANKS: [BitBoard; 8] = [
     BitBoard(0xFF << 7 * 8),
 ];
 
-pub(super) const FILES: [BitBoard; 8] = [
+pub(crate) const FILES: [BitBoard; 8] = [
     BitBoard(0x0101010101010101 << 0),
     BitBoard(0x0101010101010101 << 1),
     BitBoard(0x0101010101010101 << 2),