paginated_each on named_scope keeps scope within block call

I found a bug when calling paginated_each on a named_scope. If you use the same find within the block, the scope still exists, bubt shouldn't. Using rails 'with_exclusive_scope' method solves the problem

Example (taken from test case) we have 11 Developers, incl. 2 poor Developer:

calling paginated_each on Developer.poor shouldn't apply the named_scope on further calls within the block. Therefore this should work:

assert_equal 2, Developer.poor.paginated_each(:per_page => 1) {

    assert_equal 11, Developer.count

}

Unfortunately this test fails. See attached patch (including test case) for fix

Cheers Tobi