toSingle
fun AsyncTerminalMethods.toSingle(vararg params: Pair<String, Any?>, onResult: (DataResult<Map<String, Any?>?>) -> Unit): Job
fun StepBuilderMethods.toSingle(vararg params: Pair<String, Any?>): TransactionStep<Map<String, Any?>?>
fun TerminalReturningMethods.toSingle(vararg params: Pair<String, Any?>): DataResult<Map<String, Any?>?>