Improve %DEFFOLDABLE and CONSTANTP
Improve %DEFFOLDABLE and CONSTANTP

attila-lendvai/iolib,sionescu/iolib,dkochmanski/iolib,lispnik/iolib,lispnik/iolib,sionescu/iolib,tiago4orion/iolib,dkochmanski/iolib,tiago4orion/iolib,attila-lendvai/iolib,shamazmazum/iolib,lispnik/iolib,shamazmazum/iolib,deadtrickster/iolib,shamazmazum/iolib,attila-lendvai/iolib,deadtrickster/iolib,deadtrickster/iolib,dkochmanski/iolib,sionescu/iolib,tiago4orion/iolib