Bitbucket is dropping support for Mercurial: https://bitbucket.org/blog/sunsetting-mercurial-support-in-bitbucket
They report declining usage with <1% of new users using it. Given the additional work required to support both, I understand. VCS variety is worthwhile though: perhaps hg-only platforms are easier to support.
miniblog.
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Two dot diffs, three dot diffs, and the novel diff approach used in Bitbucket Server: https://jira.atlassian.com/browse/BSERV-7375?focusedCommentId=1931374&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-1931374
