don't define eq/noteq implementation, prevent casting from Null<UInt> to Int/Float (close #6760)

std/hl/_std/UInt.hx

@@ -101,21 +101,10 @@ abstract UInt(Int) from Int to Int {
 		return a.toFloat() > b;
 	}
 
-	@:commutative @:op(A == B) private static inline function equalsInt<T:Int>(a:UInt, b:T):Bool {
-		return a.toInt() == b;
-	}
-
-	@:commutative @:op(A != B) private static inline function notEqualsInt<T:Int>(a:UInt, b:T):Bool {
-		return a.toInt() != b;
-	}
-
-	@:commutative @:op(A == B) private static inline function equalsFloat<T:Float>(a:UInt, b:T):Bool {
-        return a.toFloat() == b;
-    }
-
-    @:commutative @:op(A != B) private static inline function notEqualsFloat<T:Float>(a:UInt, b:T):Bool {
-        return a.toFloat() != b;
-    }
+	@:commutative @:op(A == B) private static function equalsInt<T:Int>(a:UInt, b:T):Bool;
+	@:commutative @:op(A != B) private static function notEqualsInt<T:Int>(a:UInt, b:T):Bool;
+	@:commutative @:op(A == B) private static function equalsFloat<T:Float>(a:UInt, b:T):Bool;
+    @:commutative @:op(A != B) private static function notEqualsFloat<T:Float>(a:UInt, b:T):Bool;
 
 	@:op(A >= B) private static inline function gteFloat(a:UInt, b:Float):Bool {
 		return a.toFloat() >= b;