* ext/json: merge JSON 1.7.5.

fix tests and other fixes.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38346 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/json/lib/json/add/time.rb

@@ -20,10 +20,13 @@ class Time
   # Returns a hash, that will be turned into a JSON object and represent this
   # object.
   def as_json(*)
+    nanoseconds = [ tv_usec * 1000 ]
+    respond_to?(:tv_nsec) and nanoseconds << tv_nsec
+    nanoseconds = nanoseconds.max
     {
       JSON.create_id => self.class.name,
       's'            => tv_sec,
-      'n'            => respond_to?(:tv_nsec) ? tv_nsec : tv_usec * 1000
+      'n'            => nanoseconds,
     }
   end