diff --git a/lang/README.md b/lang/README.md
index 14a4f0cf..3719d53b 100644
--- a/lang/README.md
+++ b/lang/README.md
@@ -47,7 +47,7 @@ main := fn(): uint {
 #### arithmetic
 ```hb
 main := fn(): uint {
-	return 10 - 20 / 2 + 4 * (2 + 2) - 4 * 4 + (1 << 0) + -1
+	return 10 - 20 / 2 + 4 * (2 + 2) - 4 * 4 + (true << 0) + -1
 }
 ```
 
@@ -891,8 +891,8 @@ main := fn(): int {
 	loop if y == H break else {
 		x := @as(int, 0)
 		loop if x == W break else {
-			c_r := @itf(x)
-			c_i := @itf(y)
+			c_r := @as(f64, @itf(x))
+			c_i := @as(f64, @itf(y))
 			if c_i * c_r >= 10.0 return 0
 			x += 1
 		}
@@ -1070,7 +1070,7 @@ sin := fn(theta: f32): f32 {
 	PI := 3.14159265358979323846
 	TABLE_SIZE := @as(i32, 256)
 	si := @fti(theta * 0.5 * @itf(TABLE_SIZE) / PI)
-	d := theta - @floatcast(@itf(si)) * 2.0 * PI / @itf(TABLE_SIZE)
+	d := theta - @itf(si) * 2.0 * PI / @itf(TABLE_SIZE)
 	ci := si + TABLE_SIZE / 4 & TABLE_SIZE - 1
 	si &= TABLE_SIZE - 1
 	return sin_table[@bitcast(si)] + (sin_table[@bitcast(ci)] - 0.5 * sin_table[@bitcast(si)] * d) * d
@@ -1760,7 +1760,7 @@ main := fn(): uint {
 	}
 
 	if multiple_breaks(0) != 3 {
-		return 1
+		return true
 	}
 
 	if multiple_breaks(4) != 10 {
diff --git a/lang/src/son.rs b/lang/src/son.rs
index 71693b2a..8a87b338 100644
--- a/lang/src/son.rs
+++ b/lang/src/son.rs
@@ -5558,13 +5558,13 @@ impl<'a> Codegen<'a> {
                     self.wrap_in_opt(pos, src);
                 } else {
                     debug_assert!(
-                        src.ty.is_integer() || src.ty == ty::Id::NEVER,
+                        src.ty.is_integer() || src.ty == ty::Id::BOOL,
                         "{} {}",
                         self.ty_display(src.ty),
                         self.ty_display(upcasted)
                     );
                     debug_assert!(
-                        upcasted.is_integer() || src.ty == ty::Id::NEVER,
+                        upcasted.is_integer() || src.ty == ty::Id::BOOL,
                         "{} {}",
                         self.ty_display(src.ty),
                         self.ty_display(upcasted)
diff --git a/lang/tests/son_tests_advanced_floating_point_arithmetic.txt b/lang/tests/son_tests_advanced_floating_point_arithmetic.txt
index f46cbd05..12d160e7 100644
--- a/lang/tests/son_tests_advanced_floating_point_arithmetic.txt
+++ b/lang/tests/son_tests_advanced_floating_point_arithmetic.txt
@@ -19,23 +19,22 @@ sin:
     FDIV32 r14, r14, r15
     FTI32 r14, r14, 1b
     ANDI r15, r14, 255d
-    ITF64 r16, r14
     MULI64 r15, r15, 4d
-    LRA r17, r0, :sin_table
-    LI32 r18, 1086918619w
-    FC64T32 r16, r16, 1b
+    LRA r16, r0, :sin_table
+    LI32 r17, 1086918619w
+    ITF32 r18, r14
     ADDI64 r14, r14, 64d
-    ADD64 r15, r17, r15
+    ADD64 r15, r16, r15
     LI32 r19, 1132462080w
-    FMUL32 r16, r16, r18
+    FMUL32 r17, r18, r17
     ANDI r14, r14, 255d
     LI32 r18, 1056964608w
     LD r15, r15, 0a, 4h
-    FDIV32 r16, r16, r19
+    FDIV32 r17, r17, r19
     MULI64 r14, r14, 4d
     FMUL32 r18, r15, r18
-    FSUB32 r13, r13, r16
-    ADD64 r14, r17, r14
+    FSUB32 r13, r13, r17
+    ADD64 r14, r16, r14
     FMUL32 r16, r13, r18
     LD r14, r14, 0a, 4h
     FSUB32 r14, r14, r16
@@ -43,6 +42,6 @@ sin:
     FADD32 r13, r15, r13
     CP r1, r13
     JALA r0, r31, 0a
-code size: 1315
+code size: 1311
 ret: 826
 status: Ok(())