npyHeader

import mir.ndslice : iota, sliced, map;

auto endianMark = endian == Endian.littleEndian ? "<" : ">";
string descrS, fortranS, shapeS;

auto a1 = iota(1).map!(to!int);
auto h1 = a1.npyHeader;
formattedRead(h1, npyfmt, descrS, fortranS, shapeS);
assert(descrS == endianMark ~ "i4");
assert(fortranS == "False");
assert(shapeS == "1,");

auto a23 = iota(2, 3).map!(to!double);
auto h23 = a23.npyHeader;
formattedRead(h23, npyfmt, descrS, fortranS, shapeS);
assert(descrS == endianMark ~ "f8");
assert(fortranS == "False");
assert(shapeS == "2, 3");