Flow definition

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A Flow registers its Steps, its persistence schema, and its RPC handlers.

• get_steps registers one start Step and every other Step type the Flow may reach through Step decision movements. The start Step input type is also the Flow start input type. An empty Step list, or a list with no start Step, is valid when the Flow is driven entirely by RPCs that later move into Steps.
• The persistence schema lists every Attribute and Channel used from Steps or RPCs. Dex rejects reads and writes to names that are not declared.
• Mark RPC methods with @rpc. The durable RPC name is the method name unless the decorator supplies name.

Most SDKs derive the FlowType and the StepType from the native type name unless you override it.