[common] Opposite of `test'.
Refers to actual real-world data or a program working with it. For
example, the response to "I think the record deleter is finished"
might be "Is it live yet?" or "Have you tried it out on live
data?" This usage usually carries the connotation that live data
is more fragile and must not be corrupted, or bad things will
happen. So a more appropriate response might be: "Well, make sure
it works perfectly before we throw live data at it." The
implication here is that record deletion is something pretty
significant, and a haywire record-deleter running amok live would
probably cause great harm.
