This class supports two mutually-exclusive modes: PreloadBytes: An asynchronous inner archive is opened using the passed-in CreateAsyncArchive function; this call is made asynchronously on a TaskGraph thread. The size is read during initialization. After initialization, when StartPreload is called, an array of bytes equal in size to the inner archive's size is allocated, and an asynchronous ReadRequest is sent to the IAsyncReadFileHandle to read the first bytes of the file. Upon completion of each in-flight ReadRequest, another asynchronous ReadRequest is issued, until the entire file has been read. If serialize functions are called beyond the bytes of the file that have been cached so far, they requests are satisfied by synchronous reads.