IBufferWriter<T>
Represents a sink
Requests the Memory<T> that is at least sizeHint in size if possible, otherwise returns maximum available memory.
If sizeHint is equal to 0, currently available memory would get returned.
Requests the Span<T> that is at least sizeHint in size if possible, otherwise returns maximum available memory.
If sizeHint is equal to 0, currently available memory would get returned.