Compatibility with ActiveSupport

Closes #2

Author: jscheid

Gemfile

@@ -6,6 +6,7 @@ group :development, :test do
   gem 'simplecov-lcov', '~> 0.8',  platforms: :mri
   gem 'benchmark-ips'
   gem 'rake'
+  gem 'activesupport'
 end
 
 group :debug do

lib/json/canonicalization.rb

@@ -15,7 +15,7 @@ class Object
   # Default canonicalization output for Ruby objects
   # @return [String]
   def to_json_c14n
-    self.to_json
+    ::JSON.generate(self)
   end
 end
 
@@ -86,15 +86,14 @@ class String
   # Output JSON with control characters escaped
   # @return [String]
   def to_json_c14n
-    self.to_json
+    ::JSON.generate(self)
   end
 end
 
 class Symbol
   # Output JSON with control characters escaped
   # @return [String]
   def to_json_c14n
-    self.to_json
+    ::JSON.generate(self)
   end
 end
-

spec/spec_helper.rb

@@ -2,6 +2,8 @@
 
 require "bundler/setup"
 require 'rspec'
+require 'active_support'
+require 'active_support/core_ext'
 
 begin
   require 'simplecov'