The URLs Discourse generates for sharing posts include your username in a URL parameter.
Example: https://forums.swift.org/t/why-the-constraint-collection-indices-index-collection-index/7635?u=ole (note the
?u=ole at the end).
If possible, I'd like to ask the admins to disable this "functionality". It can be a potential privacy issue if you're not careful to delete the parameter, and I see no significant benefit to having it. In addition, it makes the URLs uglier than they have to be.
To try this for yourself, copy the permalink from the timestamp of this post or use the Share button underneath the post.