2 files changed, 5 insertions, 4 deletions
diff --git a/activesupport/lib/active_support/cache.rb b/activesupport/lib/active_support/cache.rb
index 8b45efaf2a..6535cc1eb5 100644
--- a/activesupport/lib/active_support/cache.rb
+++ b/activesupport/lib/active_support/cache.rb
@@ -139,7 +139,7 @@ module ActiveSupport
     # large enough to warrant compression. To turn on compression either pass
     # <tt>:compress => true</tt> in the initializer or as an option to +fetch+
     # or +write+. To specify the threshold at which to compress values, set the
-    # <tt>:compress_threshold</tt> option. The default threshold is 32K.
+    # <tt>:compress_threshold</tt> option. The default threshold is 16K.
     class Store
 
       cattr_accessor :logger, :instance_writer => true
diff --git a/activesupport/lib/active_support/cache/file_store.rb b/activesupport/lib/active_support/cache/file_store.rb
index b431041b76..85e7e21624 100644
--- a/activesupport/lib/active_support/cache/file_store.rb
+++ b/activesupport/lib/active_support/cache/file_store.rb
@@ -14,6 +14,7 @@ module ActiveSupport
 
       DIR_FORMATTER = "%03X"
       FILENAME_MAX_SIZE = 230 # max filename size on file system is 255, minus room for timestamp and random characters appended by Tempfile (used by atomic write)
+      EXCLUDED_DIRS = ['.', '..'].freeze
 
       def initialize(cache_path, options = nil)
         super(options)
@@ -22,7 +23,7 @@ module ActiveSupport
       end
 
       def clear(options = nil)
-        root_dirs = Dir.entries(cache_path).reject{|f| f.in?(['.', '..'])}
+        root_dirs = Dir.entries(cache_path).reject{|f| f.in?(EXCLUDED_DIRS)}
         FileUtils.rm_r(root_dirs.collect{|f| File.join(cache_path, f)})
       end
 
@@ -149,7 +150,7 @@ module ActiveSupport
         # Delete empty directories in the cache.
         def delete_empty_directories(dir)
           return if dir == cache_path
-          if Dir.entries(dir).reject{|f| f.in?(['.', '..'])}.empty?
+          if Dir.entries(dir).reject{|f| f.in?(EXCLUDED_DIRS)}.empty?
             File.delete(dir) rescue nil
             delete_empty_directories(File.dirname(dir))
           end
@@ -163,7 +164,7 @@ module ActiveSupport
         def search_dir(dir, &callback)
           return if !File.exist?(dir)
           Dir.foreach(dir) do |d|
-            next if d == "." || d == ".."
+            next if d.in?(EXCLUDED_DIRS)
             name = File.join(dir, d)
             if File.directory?(name)
               search_dir(name, &callback)