base 1 bug in std.string.toString?

[nobody]

int main(char[][] args)
{
   dout.writeLine(toString(1uL,1u));
   assert( toString(12uL,1u).length == 12 );
}

This produces:

   1000000000000000000000000000000000000000000000000000000000000000000000
   Error: Assert Failure example(4)

When I think it should produce

   1