Opens the PDF file held by stream, from its current position, reading a non-seekable stream asynchronously.
public Task<PdfDocument> OpenAsync(Stream stream)
The stream. It is not disposed. A seekable stream is read in place as objects are used: keep it open and unchanged until the document is disposed. A non-seekable stream is read to its end, asynchronously, before the file is parsed.
ISO 32000-2 §7.5. As OpenAsync(Stream, CancellationToken), without cancellation.