Protected EXTNil against multiple initialization and made memory management methods into no-ops (to match the behavior of the real 'nil')
Protected EXTNil against multiple initialization and made memory management methods into no-ops (to match the behavior of the real 'nil')

sandyway/libextobjc,KBvsMJ/libextobjc,kolyuchiy/libextobjc,sunfei/libextobjc,telly/libextobjc,goodheart/libextobjc,WPDreamMelody/libextobjc,sanojnambiar/libextobjc,bboyesc/libextobjc,liuruxian/libextobjc,jiakai-lian/libextobjc