[DanielHB]

If you modify or even just move fields around the struct that also changes the way they are serialized...

You really need a serializer for this sort of thing because it can also include forwards compatibility of your data structures.

[jstimpfle]

sure, if you change the struct, it will now be different.

[edflsafoiewq]

It's typical to only append fields when you do this.