lib/mail/header.rb in mail-2.6.1 vs lib/mail/header.rb in mail-2.6.3

@@ -15,11 +15,11 @@
   #   except for CR and LF.  However, a field body may contain CRLF when
   #   used in header "folding" and  "unfolding" as described in section
   #   2.2.3.  All field bodies MUST conform to the syntax described in
   #   sections 3 and 4 of this standard.
   class Header
-    include Patterns
+    include Constants
     include Utilities
     include Enumerable
     
     @@maximum_amount = 1000
 
@@ -128,10 +128,11 @@
     #  h = Header.new
     #  h.fields = ['To: [e-mail]', 'X-Mail-SPAM: 15', 'X-Mail-SPAM: 20']
     #  h['To']          #=> '[e-mail]'
     #  h['X-Mail-SPAM'] #=> ['15', '20']
     def [](name)
-      name = dasherize(name).downcase
+      name = dasherize(name)
+      name.downcase!
       selected = select_field_for(name)
       case
       when selected.length > 1
         selected.map { |f| f }
       when !selected.blank?