FSFS verifies rep-cache when disabled

"svnadmin verify" verifies a rep-cache.db file even when rep-caching is
disabled. This appears to be intentional but I don't understand the
reasoning.

svn_fs_fs__verify calls svn_fs_fs__exists_rep_cache to see if the cache
exists and then calls svn_fs_fs__walk_rep_reference which has the
comment:

  /* Don't check ffd->rep_sharing_allowed. */
  SVN_ERR_ASSERT(ffd->format >= SVN_FS_FS__MIN_REP_SHARING_FORMAT);

Why should verify attempt to verify a cache that is disabled?

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