[Proposal] Async Foreach Prefetching

[Xyncgas]

Inside a typical async foreach loop

await foreach(var ele in MyAsyncEnumerable())
{
    //do something
}

if it's safe to assume that the enumeration of ele doesn't depend on what happens inside the body of the loop, for example reading a file over ftp, we can start doing that (prefetching) for the next enumeration while the current enumeration's body in the for loop is still executing.

[Joe4evr]

Same question not even two weeks old: #64697