add type assert in f2i & i2f
add type assert in f2i & i2f

lwahlmeier/avian,dicej/avian,lostdj/avian,bgould/avian,MaartenR/avian,MaartenR/avian,lwahlmeier/avian,marcinolawski/avian,dicej/avian,lostdj/avian,MaartenR/avian,bgould/avian,minor-jason/avian,bgould/avian,marcinolawski/avian,minor-jason/avian,marcinolawski/avian,bigfatbrowncat/avian-pack.avian,joshuawarner32/avian,joshuawarner32/avian,lwahlmeier/avian,lostdj/avian,joshuawarner32/avian,ucdseniordesign/avian,bigfatbrowncat/avian-pack.avian,lwahlmeier/avian,joshuawarner32/avian,ucdseniordesign/avian,ucdseniordesign/avian,bgould/avian,bigfatbrowncat/avian-pack.avian,dicej/avian,marcinolawski/avian,ucdseniordesign/avian,dicej/avian,minor-jason/avian,lostdj/avian,minor-jason/avian,bigfatbrowncat/avian-pack.avian,MaartenR/avian