Units in postgresql.conf -- How to report?

So assuming we allowed units in postgresql.conf, how would you report 
them with SHOW?

1. The way they were set (hard)

2. Without units (not user-friendly)

3. Always in base units (seconds or bytes)

4. The largest unit that gives an integer

(4) seems the most reasonable to me in terms of interface and 
implementation.

-- 
Peter Eisentraut
http://developer.postgresql.org/~petere/