Simplify Orchestrator#next (related to #151)
Simplify Orchestrator#next (related to #151)

w3c/echidna,catataw/echidna,w3c/echidna,catataw/echidna,rrrene/echidna,w3c/echidna,rrrene/echidna,catataw/echidna,rrrene/echidna