Oops. newSVpv sucks.
:lang<perl5> is not a special case. Just a literal to create pair.
Merge commit 'a015b5bb95ed77fc7da0d87dbbf0a37f4523705d'
begin!
const.
Merge commit 'd74701e0e0d79c4d3bf0fa5aa65963859aa508ad'
updated consts.