Create withFieldComputedPartial version that takes (from: From, failFast: Boolean) => ...

[MateuszKubuszok]

While most of the time people can get away with:

foo.intoPartial[Bar]
  .withFieldComputedPartial(_.baz, foo => ... /* partial.Result of 1 value where failFast doesn't matter */)
  .transform

sometimes they might need a but more complex logic where it does.

We are currently missing an operator that handles that, forcing people to do some workarounds.

It can be solved by adding a new customization option.