For QA-3, attempted to verify SERVER-1300 using the following:

db = db.getSiblingDB("qadb");

db.mns.drop();
db.mns.save(

{i: 1, s:'abcdefghijklmnopqrstuvwxyz'}

);
db.mns.save(

{i: 2, s:'abcde\0fghijklmnopqrstuvwxyz'}

);
db.mns.save(

{i: 3, s:'abcdefghijklm\0nopqrstuvwxyz'}

);
db.mns.save(

{i: 4, s:'abcdefghijklm\0nopqrssuvwxyz'}

);
db.mns.save(

{i: 5, s:'abcdefghijklmnopqrst\0uvwxyz'}

);
db.mns.save(

{i: 6, s:'abcdefghijklmnopqrstuvwx\0yz'}

);
db.mns.ensureIndex(

{s: 1}

);

var r = db.mns.find().sort(

{s:1}

);

The result in 1.9.2 is

> r

{ "_id" : ObjectId("4e4a97d2f1c165e78e8abf66"), "i" : 2, "s" : "abcde" } { "_id" : ObjectId("4e4a97d2f1c165e78e8abf68"), "i" : 4, "s" : "abcdefghijklm" } { "_id" : ObjectId("4e4a97d2f1c165e78e8abf67"), "i" : 3, "s" : "abcdefghijklm" } { "_id" : ObjectId("4e4a97d2f1c165e78e8abf69"), "i" : 5, "s" : "abcdefghijklmnop qrst" } { "_id" : ObjectId("4e4a97d2f1c165e78e8abf6a"), "i" : 6, "s" : "abcdefghijklmnop qrstuvwx" } { "_id" : ObjectId("4e4a97d2f1c165e78e8abf65"), "i" : 1, "s" : "abcdefghijklmnop qrstuvwxyz" }

Since we can't retrieve these strings, what's the point of worrying about the sort?

Note this isn't a JavaScript issue, because you can create such strings and get them in the shell:
> a = 'abcdef\0ghijklm'
abcdef ghijklm
> a
abcdef ghijklm
>