2.2.0-nullsafety.2 - Feb 9, 2021

• Add Selectors: select, select2, ..., select9 and selectMany.
  • Selectors can compute derived data, allowing Redux to store the minimal possible state.
  • Selectors are efficient. A selector is not recomputed unless one of its arguments changes.
  • When using the select, select2 to select9, selectMany functions,
    keeps track of the latest arguments in which your selector function was invoked.
    Because selectors are pure functions, the last result can be returned
    when the arguments match without reinvoking your selector function.
    This can provide performance benefits, particularly with selectors that perform expensive computation.
    This practice is known as memoization.