Fix Array#flatten! changed check
Fix Array#flatten! changed check

bbatsov/opal,gausie/opal,jannishuebl/opal,jgaskins/opal,Flikofbluelight747/opal,iliabylich/opal,gausie/opal,Mogztter/opal,kachick/opal,castwide/opal,wied03/opal,castwide/opal,iliabylich/opal,iliabylich/opal,Mogztter/opal,opal/opal,Flikofbluelight747/opal,domgetter/opal,kachick/opal,fazibear/opal,c42engineering/opal,catprintlabs/opal,suyesh/opal,gabrielrios/opal,opal/opal,wied03/opal,domgetter/opal,Ajedi32/opal,gabrielrios/opal,catprintlabs/opal,wied03/opal,kachick/opal,castwide/opal,Ajedi32/opal,jgaskins/opal,suyesh/opal,opal/opal,merongivian/opal,Mogztter/opal,c42engineering/opal,Mogztter/opal,jannishuebl/opal,suyesh/opal,jgaskins/opal,merongivian/opal,jannishuebl/opal,gabrielrios/opal,catprintlabs/opal,opal/opal,c42engineering/opal,bbatsov/opal,gausie/opal,merongivian/opal,fazibear/opal,Ajedi32/opal,bbatsov/opal,Flikofbluelight747/opal,kachick/opal,fazibear/opal