DirEntry isDir not working?

[Josh]

Code:
import std.file;
import std.stdio;

void main()
{
    writeln(DirEntry("F:\\").isDir());
    writeln(DirEntry("F:").isDir());
    writeln(DirEntry("F:\\folder\\").isDir());
    writeln(DirEntry("F:\\folder").isDir());
    writeln("F:\\".isDir());
    writeln("F:".isDir());
    writeln("F:\\folder\\".isDir());
    writeln("F:\\folder".isDir());
    foreach (d; dirEntries("F:\\", SpanMode.shallow))
    {
        write(d.name ~ "\t");
        writeln(d.isDir());
    }
    foreach (d; dirEntries("F:", SpanMode.shallow))
    {
        write(d.name ~ "\t");
        writeln(d.isDir());
    }
}
Output:
false
false
false
false
true
true
true
true
F:\folder       true
F:\folder       true

Is anybody able to explain why a DirEntry can't seem to detect 
whether a directory is in fact a directory, whereas plain isDir 
and even a DirEntry inside dirEntries can?

Thanks,

Josh