[boost] Stale branch removal - safe?

Subject: [boost] Stale branch removal - safe?
From: James E. King, III (jking_at_[hidden])
Date: 2018-03-26 20:10:44

There are some stale branches (over 7 years old) from the svn conversion in
the Boost.Uuid (and other) repository:

https://github.com/boostorg/uuid/branches/stale

Is it safe to remove these?   example name:  svn-branches/units/autoprefix

Apart from "master" and "develop" branches and all the version tags, is
anything else sacred for branches or tags?

Thanks,

Jim