Cookie#new: Reject a mixed case symbol as keyword for simplicity.

This fixes error with Ruby 1.8.

lib/http/cookie.rb

@@ -111,15 +111,11 @@ class HTTP::Cookie
   #     new(**attr_hash)
   #
   # Creates a cookie object.  For each key of `attr_hash`, the setter
-  # is called if defined.  Each key can be either a symbol or a
-  # string of downcased attribute names.
-  #
-  # This method accepts any attribute name for which a setter method
-  # is defined.  Beware, however, any error (typically ArgumentError)
-  # a setter method raises will be passed through.  It is preferred
-  # that each keyword is a downcased symbol.  Support for strings and
-  # mixed case keywords will be obsoleted when ruby 2.0 keyword syntax
-  # is adopted.
+  # is called if defined and any error (typically ArgumentError or
+  # TypeError) that is raised will be passed through.  Each key can be
+  # either a downcased symbol or a string that may be mixed case.
+  # Support for the latter may, however, be obsoleted in future when
+  # Ruby 2.0's keyword syntax is adopted.
   #
   # If `value` is omitted or it is nil, an expiration cookie is
   # created unless `max_age` or `expires` (`expires_at`) is given.
@@ -183,20 +179,17 @@ class HTTP::Cookie
         @httponly = val
       when :secure, :secure?
         @secure = val
-      when /[A-Z]/
-        warn "keyword should be downcased: #{okey.inspect}" if $VERBOSE
-        key = key.downcase
-        redo
       when Symbol
         setter = :"#{key}="
         if respond_to?(setter)
           __send__(setter, val)
         else
-          warn "unknown keyword: #{okey.inspect}" if $VERBOSE
+          warn "unknown attribute name: #{okey.inspect}" if $VERBOSE
+          next
         end
       when String
-        warn "use symbol for keyword: #{okey.inspect}" if $VERBOSE
-        key = key.to_sym
+        warn "use downcased symbol for keyword: #{okey.inspect}" if $VERBOSE
+        key = key.downcase.to_sym
         redo
       else
         warn "invalid keyword ignored: #{okey.inspect}" if $VERBOSE

test/test_http_cookie.rb

@@ -528,25 +528,25 @@ class TestHTTPCookie < Test::Unit::TestCase
 
     # various keywords
     [
-      [:Expires,  /should be downcased/],
-      ["Expires", /should be downcased.*use symbol/m],
+      ["Expires", /use downcased symbol/],
     ].each { |key, pattern|
       assert_warning(pattern, "warn of key: #{key.inspect}") {
         cookie = HTTP::Cookie.new(:value => 'value', :name => 'key', key => expires.dup)
         assert_equal 'key', cookie.name
         assert_equal 'value', cookie.value
-        assert_equal expires, cookie.expires
+        assert_equal expires, cookie.expires, "key: #{key.inspect}"
       }
     }
     [
-      [:expires?, /unknown keyword/],
+      [:Expires,   /unknown attribute name/],
+      [:expires?,  /unknown attribute name/],
       [[:expires], /invalid keyword/],
     ].each { |key, pattern|
       assert_warning(pattern, "warn of key: #{key.inspect}") {
         cookie = HTTP::Cookie.new(:value => 'value', :name => 'key', key => expires.dup)
         assert_equal 'key', cookie.name
         assert_equal 'value', cookie.value
-        assert_equal nil, cookie.expires
+        assert_equal nil, cookie.expires, "key: #{key.inspect}"
       }
     }