diff --git a/src/logic.rs b/src/logic.rs
index 55ecca3..d38a2a9 100644
--- a/src/logic.rs
+++ b/src/logic.rs
@@ -2,6 +2,7 @@ use crate::smallint::SmallUintType;
 use crate::SmallUint;
 use core::mem::ManuallyDrop;
 use core::ops::{BitAnd, BitOr, BitXor};
+use core::ops::{BitAndAssign, BitOrAssign, BitXorAssign};
 
 macro_rules! basic_op {
     ($imp:ident, $typ:ty, $fun:ident) => {
@@ -90,6 +91,18 @@ fn bitand(a: &SmallUint, b: &SmallUint) -> SmallUint {
 
 basic_op!(BitAnd, SmallUint, bitand);
 
+impl<'a> BitAndAssign<&'a SmallUint> for SmallUint {
+    fn bitand_assign(&mut self, rhs: &'a SmallUint) {
+        *self = self.clone() & rhs;
+    }
+}
+
+impl BitAndAssign<SmallUint> for SmallUint {
+    fn bitand_assign(&mut self, rhs: SmallUint) {
+        *self = self.clone() & rhs;
+    }
+}
+
 fn bitor(a: &SmallUint, b: &SmallUint) -> SmallUint {
     match (&a.0, &b.0) {
         (&SmallUintType::Inline(i), &SmallUintType::Inline(j)) => {
@@ -140,6 +153,18 @@ fn bitor(a: &SmallUint, b: &SmallUint) -> SmallUint {
 
 basic_op!(BitOr, SmallUint, bitor);
 
+impl<'a> BitOrAssign<&'a SmallUint> for SmallUint {
+    fn bitor_assign(&mut self, rhs: &'a SmallUint) {
+        *self = self.clone() | rhs;
+    }
+}
+
+impl BitOrAssign<SmallUint> for SmallUint {
+    fn bitor_assign(&mut self, rhs: SmallUint) {
+        *self = self.clone() | rhs;
+    }
+}
+
 fn bitxor(a: &SmallUint, b: &SmallUint) -> SmallUint {
     match (&a.0, &b.0) {
         (&SmallUintType::Inline(i), &SmallUintType::Inline(j)) => {
@@ -201,3 +226,15 @@ fn bitxor(a: &SmallUint, b: &SmallUint) -> SmallUint {
 }
 
 basic_op!(BitXor, SmallUint, bitxor);
+
+impl<'a> BitXorAssign<&'a SmallUint> for SmallUint {
+    fn bitxor_assign(&mut self, rhs: &'a SmallUint) {
+        *self = self.clone() ^ rhs;
+    }
+}
+
+impl BitXorAssign<SmallUint> for SmallUint {
+    fn bitxor_assign(&mut self, rhs: SmallUint) {
+        *self = self.clone() ^ rhs;
+    }
+}
diff --git a/src/ops.rs b/src/ops.rs
index be7e3d7..e9e8246 100644
--- a/src/ops.rs
+++ b/src/ops.rs
@@ -2,6 +2,7 @@ use crate::smallint::{SmallIntType, SmallUintType};
 use crate::{SmallInt, SmallUint};
 use core::mem::ManuallyDrop;
 use core::ops::{Add, Mul, Neg, Sub};
+use core::ops::{AddAssign, MulAssign, SubAssign};
 
 impl Neg for SmallInt {
     type Output = Self;
@@ -142,6 +143,18 @@ fn add(a: &SmallUint, b: &SmallUint) -> SmallUint {
 
 basic_op!(Add, add, SmallUint, add);
 
+impl<'a> AddAssign<&'a SmallUint> for SmallUint {
+    fn add_assign(&mut self, rhs: &'a SmallUint) {
+        *self = self.clone() + rhs;
+    }
+}
+
+impl AddAssign<SmallUint> for SmallUint {
+    fn add_assign(&mut self, rhs: SmallUint) {
+        *self = self.clone() + rhs;
+    }
+}
+
 fn add_signed(a: &SmallInt, b: &SmallInt) -> SmallInt {
     let a_sign;
     match &a.0 {
@@ -192,6 +205,18 @@ fn add_signed(a: &SmallInt, b: &SmallInt) -> SmallInt {
 
 basic_op!(Add, add, SmallInt, add_signed);
 
+impl<'a> AddAssign<&'a SmallInt> for SmallInt {
+    fn add_assign(&mut self, rhs: &'a SmallInt) {
+        *self = self.clone() + rhs;
+    }
+}
+
+impl AddAssign<SmallInt> for SmallInt {
+    fn add_assign(&mut self, rhs: SmallInt) {
+        *self = self.clone() + rhs;
+    }
+}
+
 fn sub_two_slices(slice1: &[u32], slice2: &[u32]) -> Vec<u32> {
     let b = slice1.len();
     let s = slice2.len();
@@ -277,12 +302,36 @@ fn sub(a: &SmallUint, b: &SmallUint) -> SmallUint {
 
 basic_op!(Sub, sub, SmallUint, sub);
 
+impl<'a> SubAssign<&'a SmallUint> for SmallUint {
+    fn sub_assign(&mut self, rhs: &'a SmallUint) {
+        *self = self.clone() - rhs;
+    }
+}
+
+impl SubAssign<SmallUint> for SmallUint {
+    fn sub_assign(&mut self, rhs: SmallUint) {
+        *self = self.clone() - rhs;
+    }
+}
+
 fn sub_signed(a: &SmallInt, b: &SmallInt) -> SmallInt {
     a + (-b.clone())
 }
 
 basic_op!(Sub, sub, SmallInt, sub_signed);
 
+impl<'a> SubAssign<&'a SmallInt> for SmallInt {
+    fn sub_assign(&mut self, rhs: &'a SmallInt) {
+        *self = self.clone() - rhs;
+    }
+}
+
+impl SubAssign<SmallInt> for SmallInt {
+    fn sub_assign(&mut self, rhs: SmallInt) {
+        *self = self.clone() - rhs;
+    }
+}
+
 // Taken from https://github.com/rust-lang/rust/issues/85532#issuecomment-916309635. Credit to
 // AaronKutch.
 const fn carrying_mul_u128(lhs: u128, rhs: u128, carry: u128) -> (u128, u128) {
@@ -468,6 +517,18 @@ fn mul(a: &SmallUint, b: &SmallUint) -> SmallUint {
 
 basic_op!(Mul, mul, SmallUint, mul);
 
+impl<'a> MulAssign<&'a SmallUint> for SmallUint {
+    fn mul_assign(&mut self, rhs: &'a SmallUint) {
+        *self = self.clone() * rhs;
+    }
+}
+
+impl MulAssign<SmallUint> for SmallUint {
+    fn mul_assign(&mut self, rhs: SmallUint) {
+        *self = self.clone() * rhs;
+    }
+}
+
 fn mul_signed(a: &SmallInt, b: &SmallInt) -> SmallInt {
     let a_sign;
     match &a.0 {
@@ -508,3 +569,15 @@ fn mul_signed(a: &SmallInt, b: &SmallInt) -> SmallInt {
 }
 
 basic_op!(Mul, mul, SmallInt, mul_signed);
+
+impl<'a> MulAssign<&'a SmallInt> for SmallInt {
+    fn mul_assign(&mut self, rhs: &'a SmallInt) {
+        *self = self.clone() * rhs;
+    }
+}
+
+impl MulAssign<SmallInt> for SmallInt {
+    fn mul_assign(&mut self, rhs: SmallInt) {
+        *self = self.clone() * rhs;
+    }
+}
diff --git a/src/pretty.rs b/src/pretty.rs
index 8f6be5b..5c122c7 100644
--- a/src/pretty.rs
+++ b/src/pretty.rs
@@ -6,31 +6,51 @@ use crate::smallint::{SmallIntType, SmallUintType};
 #[cfg(feature = "num-bigint")]
 use num_bigint::{BigInt, BigUint};
 
-#[cfg(feature = "num-bigint")]
 impl core::fmt::Debug for SmallInt {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", BigInt::from(self))
+        match self.0 {
+            SmallIntType::Inline(i) => {
+                write!(f, "{}", i)?;
+            }
+            SmallIntType::Heap((r, s)) => {
+                #[cfg(feature = "num-bigint")]
+                write!(f, "{}", BigInt::from(self))?;
+
+                #[cfg(not(feature = "num-bigint"))]
+                todo!();
+            }
+        }
+        Ok(())
     }
 }
 
-#[cfg(feature = "num-bigint")]
 impl core::fmt::Debug for SmallUint {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", BigUint::from(self))
+        match self.0 {
+            SmallUintType::Inline(i) => {
+                write!(f, "{}", i)?;
+            }
+            SmallUintType::Heap((r, s)) => {
+                #[cfg(feature = "num-bigint")]
+                write!(f, "{}", BigUint::from(self))?;
+
+                #[cfg(not(feature = "num-bigint"))]
+                todo!();
+            }
+        }
+        Ok(())
     }
 }
 
-#[cfg(feature = "num-bigint")]
 impl core::fmt::Display for SmallInt {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", BigInt::from(self))
+        write!(f, "{:?}", self)
     }
 }
 
-#[cfg(feature = "num-bigint")]
 impl core::fmt::Display for SmallUint {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        write!(f, "{}", BigUint::from(self))
+        write!(f, "{:?}", self)
     }
 }
 
diff --git a/src/smallint.rs b/src/smallint.rs
index d600b5b..5266be0 100644
--- a/src/smallint.rs
+++ b/src/smallint.rs
@@ -1,3 +1,4 @@
+use core::hash::Hash;
 use core::mem::ManuallyDrop;
 
 /// An integer-like type that will store small integers up to `i128` inline. Larger integers are
@@ -67,3 +68,28 @@ impl Clone for SmallInt {
         }
     }
 }
+
+impl Hash for SmallUint {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        match self.0 {
+            SmallUintType::Inline(i) => i.hash(state),
+            SmallUintType::Heap((r, s)) => {
+                let slice = unsafe { core::slice::from_raw_parts(r, s) };
+                slice.hash(state);
+            }
+        }
+    }
+}
+
+impl Hash for SmallInt {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        match self.0 {
+            SmallIntType::Inline(i) => i.hash(state),
+            SmallIntType::Heap((r, s)) => {
+                let size = usize::try_from(s.abs()).unwrap();
+                let slice = unsafe { core::slice::from_raw_parts(r, size) };
+                slice.hash(state);
+            }
+        }
+    }
+}