When Mercurial HTTPS URL is set as email:password@host, on every update the plugin fully cleans the workspace instead of the incremental build. The reason is that is compares original URL

john@example.com:password@host

with an escaped version

john%40example.com:password@host

they do not match, and hg/plugin reports that "looks different than", and does a full clone.

P.S. The logins in form of email are used, for example, by Kiln.