'recursive toObject' 13076 assertion failed in MongoDB
===

today my map function started reporting assertion failure 13076 'recursive toObject' code. It worked just fine yesterday.

Here's my map function:

    function () {
        for(i=0; i<this.values.length; i++) {
            emit(this.values[i].id, {
                'id': this.values[i].id,
                'start_date': this.values[i].start_date,
                'end_date': this.values[i].end_date,
                'hash': this.values[i].hash,
                'url': this.values[i].url});
        }  
    }

I have tried replacing for loop with forEach function, but result is the same.  
  
What is interesting function with scope variable limiting map function to single emit works just fine:

    function () {
        for(i=0; i<this.values.length; i++) {
            if(this.values[i].id == myId) {
                emit(this.values[i].id, {
                    'id': this.values[i].id,
                    'start_date': this.values[i].start_date,
                    'end_date': this.values[i].end_date,
                    'hash': this.values[i].hash,
                    'url': this.values[i].url});
            }
        }
    }

I can, of course, perform this mapping directly in code, but I wouldn't want to encounter this error some other time when I really need to use MapReduce.