public SequenceReader(ReadOnlySequence <T> sequence)
{
CurrentSpanIndex = 0;
Consumed = 0;
Sequence = sequence;
_currentPosition = sequence.Start;
_length = -1;
var first = sequence.First.Span;
sequence.GetFirstSpan(out ReadOnlySpan <T> first, out _nextPosition);
CurrentSpan = first;
_moreData = first.Length > 0;
if (!_moreData && !sequence.IsSingleSegment)
{
_moreData = true;
GetNextSpan();
}
}