message: coalesce addRecord + addToRelatedRecords + removeRecord
diff: @@ -200,6 +200,10 @@ function mergeOperations(superceded: RecordOperation, superceding: RecordOperati
  }
  }
  }
  + } else if (equalRecordIdentities(superceded.relatedRecord, superceding.record)) {
  + if (superceding.op === 'removeRecord') {
  + markOperationToDelete(superceded);
  + }
  }
  }
  