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t = db.mr_undef;
t.drop();
outname = "mr_undef_out";
out = db[outname];
out.drop();
t.insert({x : 0});
var m = function() { emit(this.mod, this.x); };
var r = function(k,v) { total = 0; for(i in v) { total+= v[i]; } return total; };
res = t.mapReduce(m, r, {out : outname } );
assert.eq( 0 , out.find( { _id : { $type : 6 } } ).itcount() , "A1" );
assert.eq( 1 , out.find( { _id : { $type : 10 } } ).itcount() , "A2" );
x = out.findOne();
assert.eq( x , out.findOne( { _id : x["_id"] } ) , "A3" );
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