Fix scala#5269: Fix StagedTuple/Tuple implementation

Author: nicolasstucki

library/src-scala3/scala/StagedTuple.scala

@@ -190,9 +190,7 @@ object StagedTuple {
       case Some(4) =>
         self.as[Tuple4[_, _, _, _]].bind(t => '(Tuple5(~x, (~t)._1, (~t)._2, (~t)._3, (~t)._4)))
       case Some(n) =>
-        // TODO bind in toArrayStaged instead
-        val arr = '($consArray(~x, ~toArrayStaged(self, tailSize)))
-        arr.bind(arr => fromArrayStaged[H *: T](arr, Some(n + 1)))
+        fromArrayStaged[H *: T]('($consArray(~x, ~toArrayStaged(self, tailSize))), Some(n + 1))
       case _ =>
         '(dynamic_*:[T, H](~self, ~x))
     }

library/src-scala3/scala/Tuple.scala

@@ -131,7 +131,7 @@ object Tuple {
       val t = self.asInstanceOf[Tuple4[Object, Object, Object, Object]]
       Array(t._1, t._2, t._3, t._4)
     case self: TupleXXL =>
-      asInstanceOf[TupleXXL].elems
+      self.elems
     case self: Product =>
       val arr = new Array[Object](self.productArity)
       for (i <- 0 until arr.length) arr(i) = self.productElement(i).asInstanceOf[Object]