enum DogCommand {
  SIT
  HEEL
}

type Dog {
  doesKnowCommand(dogCommand: DogCommand): Boolean
}

type Query {
  pet: Dog
}

query queryPupper {
  pet {
    ...mergeIdenticalFieldsWithIdenticalArgs
  }
}

query queryPupperAgain($dogCommand: DogCommand) {
  pet {
    ...mergeIdenticalFieldsWithIdenticalValues
  }
}

fragment mergeIdenticalFieldsWithIdenticalArgs on Dog {
  doesKnowCommand(dogCommand: SIT)
  doesKnowCommand(dogCommand: SIT)
}

fragment mergeIdenticalFieldsWithIdenticalValues on Dog {
  doesKnowCommand(dogCommand: $dogCommand)
  doesKnowCommand(dogCommand: $dogCommand)
}