public override long GetLongHashCode(Utf8Memory value)
 {
     var(h1, h2) = NonRandomLongUtf8StringComparer.Hash(value.Span);
     return((long)((ulong)h2 << 32 | h1));
 }
 public override int GetHashCode(Utf8Memory value)
 {
     var(h1, h2) = NonRandomLongUtf8StringComparer.Hash(value.Span);
     return((int)(h1 + (h2 * 1566083941)));
 }