Bits in reverse order in BitArray

[Christian Manning]

Hi, when I populate a BitArray using .init, the bits are in reverse 
order, although the bytes are in the correct order.
eg:

import std.stdio,std.bitmanip;
void main() {
    ubyte[] arr = [130,56,43,2];

    BitArray ba;
    ba.init(cast(void[])arr,32);
    foreach(b; ba)
       write(cast(ubyte) b); //bits in each byte reversed
                             //01000001000111001101010001000000
    writeln();

    ba.init(cast(void[])arr.reverse,32);
    foreach(b; ba.reverse)
       write(cast(ubyte) b); //bits printed in intended order
                             //10000010001110000010101100000010
    writeln();
}

Why does this happen?

Thanks