A bit off-ticket-topic, but just to clarify some points about the cli docs here:

The cli reference doc is incorrect as of 2009-01-05, and will be amended in the
next version.  I will push the newer doc as soon as I am able to do so.

In fact, there is a <u>minimum prefix length of four characters</u> for "versions"
(see the [./concepts.wiki | concepts] page, section
<b>2.1&nbsp;Identification&nbsp;of&nbsp;Artifacts</b>, paragraph 3 beginning
"When referring"...)

Also, "version" is a bit of a misnomer, what we're actually dealing with are
<u>Artifact</u> <u>IDs</u>, which happen to be 160 bit SHA1 hash digests of
<i>n</i>-length bit sequences (which is the basic thrust of the cited section.)

And now, back to the actual feature request ...