Gets or sets the stream's data as stored in the file, before any filter is decoded. Setting marks the stream dirty.
public ReadOnlyMemory<byte> EncodedData { get; set; }
ISO 32000-2 §7.3.8.1. Setting the data does not change the dictionary's Filter entry; keep the two consistent. A stream
of a document opened from a file or a stream keeps its data in the file and reads it on each get, so read it once per use.