neat version numbering convention seen in tye's excellent Algorithm::Diff 
use vars qw( $VERSION @EXPORT_OK );
$VERSION = 1.19_02;
#          ^ ^^ ^^-- Incremented at will
#          | \+----- Incremented for non-trivial changes to features
#          \-------- Incremented for fundamental changes

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In reply to module version convention by metaperl

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