Remove redundant check for is_a?(String)

actionpack/lib/action_view/path_set.rb

@@ -15,7 +15,7 @@ module ActionView #:nodoc:
     end
 
     def find_all(path, prefixes = [], *args)
-      prefixes = Array.wrap(prefixes) if String === prefixes
+      prefixes = Array.wrap(prefixes)
       prefixes.each do |prefix|
         each do |resolver|
           templates = resolver.find_all(path, prefix, *args)

actionpack/lib/action_view/template/error.rb

@@ -29,7 +29,7 @@ module ActionView
 
     def initialize(paths, path, prefixes, partial, details, *)
       @path = path
-      prefixes = Array.wrap(prefixes) if String === prefixes
+      prefixes = Array.wrap(prefixes)
       display_paths = paths.compact.map{ |p| p.to_s.inspect }.join(", ")
       template_type = if partial
         "partial"