std.array: array, ulong and Win32

[ixid via Digitalmars-d-learn]

This seems like a reasonable use but errors, obviously I can do 
it in many other ways:

    ulong[] result = iota(1UL, 10UL).array;

Error: static assert  "Argument types in (ulong) are not all 
convertible to size_t: 
(ulong)"	C:\D\dmd2\src\phobos\std\array.d	516	

And while I'm here why do arrays not implicitly cast? ulong is 
happy to accept uint values but ulong[] will not accept uint[].