Simplify floating points comparison for Object.is (#2476)

Author: MaxGraey

std/assembly/object.ts

@@ -1,21 +1,22 @@
 export class Object {
-  static is<T>(value1: T, value2: T): bool {
+  static is<T>(x: T, y: T): bool {
     if (isFloat<T>()) {
-      if (value1 == value2) {
-        // 0 == -0, but they are not identical
-        if (sizeof<T>() == 8) {
-          // @ts-ignore: typecast
-          return reinterpret<u64>(value1) == reinterpret<u64>(value2);
-        } else {
-          // @ts-ignore: typecast
-          return reinterpret<u32>(value1) == reinterpret<u32>(value2);
-        }
+      // Float pointing is special we shoulr presere following identities:
+      // 0.0 !=-0.0
+      // NaN == NaN
+      if (sizeof<T>() == 8) {
+        return (
+          bool(u32(x != x) & u32(y != y) |
+          u32(reinterpret<u64>(f64(x)) == reinterpret<u64>(f64(y))))
+        );
+      } else {
+        return (
+          bool(u32(x != x) & u32(y != y) |
+          u32(reinterpret<u32>(f32(x)) == reinterpret<u32>(f32(y))))
+        );
       }
-      // NaN != NaN, but they are identical.
-      // @ts-ignore: typecast
-      return bool(i32(isNaN(value1)) & i32(isNaN(value2)));
     }
     // For references, strings, integers and booleans
-    return value1 == value2;
+    return x == y;
   }
 }