Implementing serialisation with minmal boilerplate and template overhead using core.reflect

[Stefan Koch]

On Sunday, 15 August 2021 at 11:18:57 UTC, Stefan Koch wrote:
> Good Day everyone,
>
> A friend asked me recently of core.reflect could be used for 
> serialization.
> [ ... ]
>
> I would like to know what you think about this

There was a bug in the code I posted.
I should have run every path before calling it a day ;)
The code for dynamic array serialization

```d
         ulong length = *cast(size_t*) ptr;
         const void* values = *cast(const ubyte**)(ptr + 
size_t.sizeof);
         auto elemType = da.nextOf;
         return serializeArray(length, ptr, elemType);
```

has to be

```d
         ulong length = *cast(size_t*) ptr;
         const ubyte* values = *cast(const ubyte**)(ptr + 
size_t.sizeof);
         auto elemType = da.nextOf;
         return serializeArray(length, ptr, values);
```
and of course serializeArray has to write the length as well for 
this to work as without the length information you cannot 
de-serialize.