Better way of setting items in lists

[Ashvin-Ranjan]

Currently in N to do something like this:

boardShadows[i][j][k] = True

You have to do:

boardShadows = [
  ..boardShadows.subsection(0, i),
  [
    ..(boardShadows[i] | []).subsection(0, j),
    [
      ..(boardShadows[i][j] | []).subsection(0, k),
      true,
      ..(boardShadows[i][j] | []).subsection(k + 1, (boardShadows[i][j] | []).len()),
    ],
    ..(boardShadows[i] | []).subsection(j + 1, (boardShadows[i] | []).len()),
  ],
  ..boardShadows.subsection(i + 1, boardShadows.len())
]

This is really cumbersome and large for such a simple task, there surely has to be a better way.