Fix type errors

Library/Homebrew/extend/array.rb

@@ -32,11 +32,12 @@ class Array
     when 0
       +""
     when 1
-      +(self[0]).to_s
+      # This is not typesafe, if the array contains a BasicObject
+      +T.unsafe(self[0]).to_s
     when 2
       +"#{self[0]}#{two_words_connector}#{self[1]}"
     else
-      +"#{self[0...-1].join(words_connector)}#{last_word_connector}#{self[-1]}"
+      +"#{T.must(self[0...-1]).join(words_connector)}#{last_word_connector}#{self[-1]}"
     end
   end
 end