Quota question

[Ralf Hildebrandt]

http://wiki2.dovecot.org/Quota/Configuration
says:

concat('*:bytes=', quota_limit_bytes) AS quota_rule
and
concat('*:bytes=', quota_limit_bytes) AS userdb_quota_rule

but a generic quota_rule on the same page says:

plugin {
  quota = maildir:User quota
  quota_rule = *:storage=1G
  quota_rule2 = Trash:storage=+100M
}

Are "bytes=" and "storage=" equivalent?

http://wiki2.dovecot.org/UserDatabase/ExtraFields 
also shows "storage=":

user_query = SELECT home, uid, gid, \
  '*:storage=100M' as quota_rule, mail_plugins, \
  'gz' as `plugin/zlib_save` FROM users WHERE userid = '%u'

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