add safe attribute to the unittests toRepresentation t fix older compilers
add safe attribute to the unittests toRepresentation t fix older compilers

(cherry picked from commit 8c958bae7761370d080bbacb3f0c9505c87933ca)

gedaiu/vibe.d,etcimon/vibe.d,DBankov/vibe.d,etcimon/vibe.d,chalucha/vibe.d,rejectedsoftware/vibe.d,Geod24/vibe.d