ProperNumberComparisons is disabled by default (until LDC decision)

compiler/testData/codegen/box/ieee754/smartCastToDoubleAndComparableToDouble.kt

@@ -0,0 +1,13 @@
+// !LANGUAGE: +ProperIeee754Comparisons
+
+val minus: Any = -0.0
+
+fun box(): String {
+    if (minus is Comparable<*> && minus is Double) {
+        if (minus < 0.0) return "fail 0"
+        if ((minus) != 0.0) return "fail 1"
+        if (minus != 0.0) return "fail 2"
+        if (minus != 0.0F) return "fail 3"
+    }
+    return "OK"
+}