Testing pull command on sub document array in mongoose 3.5.4. There seems to be an order dependent issue when making other modifications to the same sub document array.

mongoosepulltest.js

var mongoose = require('mongoose');
mongoose.set('debug', true);
var mongooseConnection = mongoose.createConnection('mongodb://localhost/mongoosepulltest');

var SubDocSchema = new mongoose.Schema({
    someValue: { type: Number },
},{
    versionKey: false
});

var DocSchema = new mongoose.Schema({
    someId: { type: Number },    
    subDocs: [SubDocSchema],
});

var Doc = mongooseConnection.model('Doc', DocSchema)
var main = new Doc({
    someId: 1,
    subDocs: [{ someValue: 1 },{ someValue: 2 },{ someValue: 3 }]
});
main.save(function(err) {
    if (err) { return console.log(err); }
    Doc.findOne({someId: 1}, function(err, doc){
        if (err) { return console.log(err); }

        // This works fine
        //var mySub = doc.subDocs[2];
        //doc.subDocs.pull(doc.subDocs[1]);
        //mySub.someValue = 5;
        
        // This will stomp the = 5 change.
        var mySub = doc.subDocs[2];
        mySub.someValue = 5;
        doc.subDocs.pull(doc.subDocs[1]);

        doc.save(function(err) {
            if (err) { return console.log(err); }
        });
    });
});