fat struct style guide?

[Kapendev]

On Tuesday, 24 February 2026 at 19:01:35 UTC, monkyyy wrote:
> On Tuesday, 24 February 2026 at 18:49:58 UTC, user1234 wrote:
>> On Tuesday, 24 February 2026 at 16:56:57 UTC, monkyyy wrote:
>>> [...]
>>
>> The tagged union approach is actually faster when you deal 
>> with a situation such as
>>
>> - you only care about final types
>> - your final types have several bases
>> - you would cast a lot
>> - you don't care about nicely looking declarations (e.g SDL 
>> event, XEvent, etc 🤢)
>
> Consider the `old` function, a tagged union would add a layer 
> of indirection that does nothing.

You get the same type of indirection with a "mega struct" if we 
are talking about type checking.
And you will be checking types often in a game.
There is literally no difference in how a tagged union and a mega 
struct works if you create a union with members that all share 
the same first field.
The only difference will be the size, with tagged unions being 
smaller and faster to iterate over.