[MemoryPackUnion(ushort tag, Type type )] the "tag" parameter is kinda excessive, can it be removed or optional?

[xiaoyuvax]

Suggest: MemoryPackUnion(Type type, ushort? tag=null )]
if null, code generator assign the tag for each type accordingly.

I don't know why must serve this tag parameter to the the MemoryPackUnion attribute, it's boring to assign a sequence of unfriendly numbers which will not be used later to a pile of classes.

[neuecc]

completely no, set explicitly.

[xiaoyuvax]

I don't care the sequence of the type registered, and the numebrs r not gonna be reused, why can't the generator just fill it automatically?
omg, what if i have hundreds classes to register?

[neuecc]

If you have hundreds of them, you can just fill in the sequential numbers if they're auto-generated. If not, you can just fill them.
For Union tags, please CARE, for Version Tolerant.

[xiaoyuvax]

ok, i got it, seems Version Toloerance also requires carefully handle of these numbers, in another word, the orders, right?
but declare orders of the [MemoryPackUnion] already implies the orders for serialization, why not just use the declare order instead of the tags, even for Version Tolerance?

is

[MemoryPackUnion(0,Type1)]
[MemoryPackUnion(1,Type2)]
[MemoryPackUnion(2,Type3)]

equal to

[MemoryPackUnion(1,Type1)]
[MemoryPackUnion(3,Type2)]
[MemoryPackUnion(5,Type3)]

?

[neuecc]

What do you do when you delete type.
Basically, I prefer to be explicit, automatically member order is a special exception for me.

[xiaoyuvax]

The order is not automatically random, u can INFER the order from the [MemoryPackUnion] declaration?
and eliminate a parameter as to make coding easier.
Maxmize inference might reduce redundancy of information and coding, and maybe a good principle to take.

What's the differences below?

[MemoryPackUnion(Type1)]
[MemoryPackUnion(Type2)]   <- deleted
[MemoryPackUnion(Type3)]

[MemoryPackUnion(1,Type1)]
[MemoryPackUnion(3,Type3)]
[MemoryPackUnion(2,Type2)]  <-deleted

[xiaoyuvax]

or [MemoryPackUnion(IList<Type>)] is better?