message: Remove note about deterministic tests.
  HashMaps are only problematic in that regard if you _iterate_ over them.
diff: @@ -136,7 +136,6 @@ pub(crate) struct State<C: Context> {
  /// through `i`.
  cumulative_w: ValidatorMap<Weight>,
  /// All units imported so far, by hash.
  - // TODO: HashMaps prevent deterministic tests.
  units: HashMap<C::Hash, Unit<C>>,
  /// All blocks, by hash.
  blocks: HashMap<C::Hash, Block<C>>,
  