What is wrong with a Decision step's key, as a phrase in ReadFlowDecisionStepConfiguration's
voice, or null when a path condition can name the step by it.
The reader's own key check, exported so an editor can say it about a key the author has not
committed yet. Whether another Decision step already uses the key is a question about the whole
flow, which CollectDecisionStepKeys answers.
Parameters
key: unknown
the key to check, as it would be stored (untrimmed)
What is wrong with a Decision step's key, as a phrase in ReadFlowDecisionStepConfiguration's voice, or
nullwhen a path condition can name the step by it.The reader's own key check, exported so an editor can say it about a key the author has not committed yet. Whether another Decision step already uses the key is a question about the whole flow, which
CollectDecisionStepKeysanswers.