code: function processNested (data, reqStack) {
    const updateWith = {}
    for (const key in data) {
      const val = data[key]
  
      if (val instanceof Array) {
        updateWith[key] = processArray(val, reqStack)
        continue
      }
  
      if (val instanceof Object) {
        updateWith[key] = schemaForm(val, reqStack, key)
        continue
      }
    }
    return updateWith
  }
docs: Call `schemaForm` for all nested objects.
  
  @param  {Object} data
  @param  {Array} reqStack - Stack of required properties.
  @returns  {Object}