Convert strings to numbers in meteor mongo

convert.js

Beatmaps.find().forEach(function(x) {
    Beatmaps.update({_id: x._id}, {
      $set: {
        approved: Number(x.approved),
        total_length: Number(x.total_length),
        hit_length: Number(x.hit_length),
        diff_size: Number(x.diff_size),
        diff_overall: Number(x.diff_overall),
        diff_approach: Number(x.diff_approach),
        diff_drain: Number(x.diff_drain),
        mode: Number(x.mode),
        bpm: Number(x.bpm),
        genre_id: Number(x.genre_id),
        language_id: Number(x.language_id),
        favourite_count: Number(x.favourite_count),
        playcount: Number(x.playcount),
        passcount: Number(x.passcount),
        max_combo: Number(x.max_combo),
        difficultyrating: Number(x.difficultyrating)
      }
    });
  });