diff --git a/src/ast.rs b/src/ast.rs
index 17276093..378ece56 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -283,7 +283,7 @@ impl Numb {
         } else if val.is_nan() {
           format!("+NaN")
         } else {
-          format!("{:.7e}", val)
+          format!("{:?}", val)
         }
       }
       _ => {
diff --git a/src/hvm.c b/src/hvm.c
index 1562acac..3a4cda49 100644
--- a/src/hvm.c
+++ b/src/hvm.c
@@ -77,6 +77,10 @@ typedef u32 Numb; // Numb ::= 29-bit (rounded up to u32)
 #define SWIT 0x7
 
 // Numbers
+static const f32 U24_MAX = (f32) (1 << 24) - 1;
+static const f32 U24_MIN = 0.0;
+static const f32 I24_MAX = (f32) (1 << 23) - 1;
+static const f32 I24_MIN = (f32) (i32) ((-1u) << 23);
 #define TY_SYM 0x00
 #define TY_U24 0x01
 #define TY_I24 0x02
@@ -469,7 +473,7 @@ static inline Numb cast(Numb a, Numb b) {
     if (isnan(val)) {
       return new_u24(0);
     }
-    return new_u24((u32) clamp(val, 0.0, 16777215));
+    return new_u24((u32) clamp(val, U24_MIN, U24_MAX));
   }
 
   if (get_sym(a) == TY_I24 && get_typ(b) == TY_U24) {
@@ -483,7 +487,7 @@ static inline Numb cast(Numb a, Numb b) {
     if (isnan(val)) {
       return new_i24(0);
     }
-    return new_i24((i32) clamp(val, -8388608.0, 8388607.0));
+    return new_i24((i32) clamp(val, I24_MIN, I24_MAX));
   }
 
   if (get_sym(a) == TY_F24 && get_typ(b) == TY_U24) return new_f24((f32) get_u24(b));
diff --git a/src/hvm.rs b/src/hvm.rs
index c8f0c404..b494822d 100644
--- a/src/hvm.rs
+++ b/src/hvm.rs
@@ -25,6 +25,10 @@ pub struct APair(pub AtomicU64);
 
 // Number
 pub struct Numb(pub Val);
+const U24_MAX : u32 = 1 << 24 - 1;
+const U24_MIN : u32 = 0;
+const I24_MAX : i32 = 1 << 23 - 1;
+const I24_MIN : i32 = -1 << 23;
 
 // Tags
 pub const VAR : Tag = 0x0; // variable
@@ -295,11 +299,11 @@ impl Numb {
     match (a.get_sym(), b.get_typ()) {
       (TY_U24, TY_U24) => b,
       (TY_U24, TY_I24) => Self::new_u24(b.get_i24() as u32),
-      (TY_U24, TY_F24) => Self::new_u24(b.get_f24().clamp(0.0, 16777215.0) as u32),
+      (TY_U24, TY_F24) => Self::new_u24((b.get_f24() as u32).clamp(U24_MIN, U24_MAX)),
 
       (TY_I24, TY_U24) => Self::new_i24(b.get_u24() as i32),
       (TY_I24, TY_I24) => b,
-      (TY_I24, TY_F24) => Self::new_i24(b.get_f24().clamp(-8388608.0, 8388607.0) as i32),
+      (TY_I24, TY_F24) => Self::new_i24((b.get_f24() as i32).clamp(I24_MIN, I24_MAX)),
 
       (TY_F24, TY_U24) => Self::new_f24(b.get_u24() as f32),
       (TY_F24, TY_I24) => Self::new_f24(b.get_i24() as f32),