Checksums stream contents as the stream is progressed through. Limited seek support on read. No seek support on write.

All properties pass through except CanRead, CanWrite, CanSeek, and Positionset (get will pass through).

Passes thorugh properties traditionally locked behind seeking (e.g. Length) regardless of read or write mode, ensuring expected stream checks are not interrupted and that exceptions only throw when unsupported behavior is actually attempted. This is done to maintain existing stream behavior as closely as possible, as this class is meant to only observe the stream contents as they flow.