CalculationResult for an operation which was a literal argument.
Instances of Inlined should never leak out of the actor world. E.g. messages
sent to clients in the Trellis world should either be Complete or Failure.
Inlined exists because these arguments don't have useful history, and
Calculations need to distinguish them from Complete results (which were
calculated operations with history).
(Since version 2.8.0) use productIterator instead