lib/tmpdir.rb in tmpdir-0.1.1 vs lib/tmpdir.rb in tmpdir-0.1.2

@@ -113,10 +113,10 @@
 
     def tmpdir
       Dir.tmpdir
     end
 
-    UNUSABLE_CHARS = [File::SEPARATOR, File::ALT_SEPARATOR, File::PATH_SEPARATOR, ":"].uniq.join("").freeze
+    UNUSABLE_CHARS = "^,-.0-9A-Z_a-z~"
 
     class << (RANDOM = Random.new)
       MAX = 36**6 # < 0x100000000
       def next
         rand(MAX).to_s(36)