| MergeT(IEnumerableIAsyncEnumerableT) | Concurrently merges all the elements of multiple asynchronous streams into a single asynchronous stream. |
| MergeT(IEnumerableIAsyncEnumerableT, Int32) | Concurrently merges all the elements of multiple asynchronous streams into a single asynchronous stream. An additional parameter specifies the maximum concurrent operations that may be in flight at any give time. |