then<Next> method
Appends a package-defined step whose input matches the current flow type.
The returned flow is a fresh single-use instance. This flow remains independently runnable.
Implementation
CryptoFlow<Next> then<Next>(CryptoStep<Current, Next> step) =>
CryptoFlow<Next>._(_source, [
..._stages,
_ErasedStage.fromStep<Current, Next>(step),
]);