Fix Native::Object#is_a? semantics
Fix Native::Object#is_a? semantics

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