[swift-evolution] [Proposal Draft] Remove open Access Modifier

Tino Heth 2th at gmx.de
Tue Feb 21 10:19:17 CST 2017

> I’ll concede that the proposal makes a claim that might very well be disproved. I would very much like to see an actual example of a public class that **has** to be public but **shouldn’t** be open for obvious reasons. I would happily accept being shown wrong on that point.
This is afaics one of the most active disputes on evolution — and you can save you a lot of grief by accepting that it is pointless:
The whole discussion isn't based on facts at all, despite many false claims that marking things as final is generally better.
I have asked for a single example to prove this in the past as well, so I guess no one can present such a thing to you.

It is personal preference, so arguments don't help much here.

Maybe it helps to know the whole story, as everything started with "final should be default", followed by a try to forbid subclassing for types from a different module by default, finally arriving at the current compromise where you have to decide wether module clients should be allowed to subclass or not.
Nobody ever requested that public should be the only access level, so there has been only been pressure applied from one direction — it's interesting to see some backlash now.
Imho people already were quite tired of discussion when public/open was accepted as a compromise...
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