On Windows, creating a nested object 1500 levels deep crashes
the shell with a stack overflow. This is presumably because of
the default stack size of 1 MB on Windows; the default stack
size on Linux is 8 MB. So, reduce the nesting level from 1500
to 700 to make the test pass on Windows.
This doesn't address the actual stack overflow problem, which
also exists on Linux but requires a larger number. Testing with
20000 crashes Linux and Mac OS X with segfaults.
