array coercion missing for subarray assignment

The following code

  int[][] arr2 = new int[1][]
  arr2[0] = [1,2]

is supported by the static compiler as well as primopts. Normal caching tends to have a ArrayStoreException here. Imho this should be supported, since groovy supports for example int[] x = [1,2] too. arr2[0] is in that respect like x an array under initialization.