code: function formatNumber (payload, schema) {
    _.forEach(schema, function(v, k) {
      if (v !== null && v._type === 'number') {
        if (typeof payload[k] === 'undefined' || payload[k] === null) {
          payload[k] = 0
        }
      }
    })
  }
docs: Initializes every empty number property of a payload, as defined in the schema provided, with 0.