/// <summary>
/// Entity of .npy binary saving.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="stream"></param>
/// <param name="ndArray"></param>
/// <param name="dtype"></param>
/// <param name="writeAt"></param>
private static void SaveCore <T>(Stream stream, NdArray <T> ndArray, DType dtype,
Action <int, byte[]> writeAt)
{
var header = new NpyHeader(1, 0, dtype, false, ndArray.Shape);
var headerBytes = header.GenerateHeader();
var bufferSize = ndArray.Shape.TotalLength;
var buffer =
new byte[dtype.ByteSize * bufferSize ?? throw new NotSupportedException()];
