While I never use these constants for anything other than setting variables I declare, it would be easy to use them otherwise. I started this habit when I was first learning perl as a way of distinguishing "logical" and "numerics" in my code and for setting "logical" options in some modules (like DBI).
This just helped me remember I was turning "off" those options instead of setting some "numeric" to zero.
$gDBHandle = DBI->connect
'dbi:Oracle:' . ORATNS, ORAUSER, ORAPASS,
AutoCommit => FALSE,
PrintError => FALSE,
RaiseError => FALSE,
) || die 'Could not connect to Oracle ['.$DBI::errstr.' - '.$DBI::er
Thank you for the suggestion.