c = db.c;
c.drop();

// Save some values.                                                                              
[
 1,
 0,
 true,
 false,
 {},
 [],
 null,
 '',
 0/0
 ].forEach( function( x ) { c.save( { a:x } ); } );

// Return each value and its boolean coerced value.                                               
result = c.aggregate( { $project: { a:'$a', bool:{ $and:[ '$a' ] } } } ).result;
for( i in result ) {
    r = result[ i ];
    // Find the boolean coerced value in javascript and check that it matches the value from      
    // the server.                                                                                
    expectedBool = !!r.a;
    assert.eq( expectedBool, r.bool, 'Expected ' + expectedBool + ' for (' + r.a + ').' );
}