HashSerializer

[KumatomatomaKu]

• Invisible to serializer_for method
  • One needs to new HashSerializer every time
  • The main reason is that Collection => Hash won't work correctly for now and cause tests to fail
• Set option uniform_collection: true so that HashSerializer check array values' first element only and assume that all the rest should use then same serializer
• int or string values work fine, no exception will be thrown
  • But be ware that values without suitable serializers will also be accepted and cause maybe unexpected output