Fix castflags bit indices

tlively · web-flow · commit 04a45aa19a2d · 2025-03-10T12:12:55.000-07:00
diff --git a/proposals/custom-rtts/Overview.md b/proposals/custom-rtts/Overview.md
@@ -564,8 +564,8 @@ Note that the bits now have the following meanings:
 ```
 bit 0: source nullability
 bit 1: target nullability
-bit 3: source exactness
-bit 4: target exactness
+bit 2: source exactness
+bit 3: target exactness
 ```
 
 The other new instructions are encoded as follows:
