On the iphone, safari tries to open these links in mail. Unescaped @ symbols are...

dang · on June 14, 2019

Please don't post shallow dismissals and please don't be snarky. These are two of the site guidelines: https://news.ycombinator.com/newsguidelines.html

Your comment would be just fine without that last sentence.

erik_seaberg · on June 14, 2019

https://www.rfc-editor.org/rfc/rfc3986.txt allows

  URI          = scheme ":" hier-part [ "?" query ] [ "#" fragment ]
  hier-part    = "//" authority path-abempty
  path-abempty = *( "/" segment )
  segment      = *pchar
  pchar        = unreserved / pct-encoded / sub-delims / ":" / "@"

and https://www.rfc-editor.org/rfc/rfc1738.txt originally said

> Within the <path> and <searchpart> components, "/", ";", "?" are reserved.

charrondev · on June 14, 2019

They open fine on my iPhone for what it’s worth. iOS 12.