fat struct style guide?

[user1234]

On Thursday, 26 February 2026 at 18:39:40 UTC, user1234 wrote:
> I see.. I thought to my reply yesterday and saw how unperfect 
> it was. What I mean is really like when you have to deal with a 
> lot of let'say base "Object"s then a tag can be faster than a 
> dynamic cast. Problem is we cant really merge struct 
> members...so even with the tag there's might be indirections, 
> compared to using a tag for class casts. I hope this is clearer 
> now.

in short. tag access is O1, dyncast is not constant time. Problem 
might be that then you have to restrict access to fields of 
whatever depends on the tag _each time_.