* ext/psych/lib/psych/visitors/to_ruby.rb: BigDecimals can be restored

  from YAML.
* ext/psych/lib/psych/visitors/yaml_tree.rb: BigDecimals can be dumped
  to YAML.
* test/psych/test_numeric.rb: tests for BigDecimal serialization

Fixes #31

2 files changed, 7 insertions, 0 deletions

diff --git a/lib/psych/visitors/to_ruby.rb b/lib/psych/visitors/to_ruby.rb
index 4267f4d..bf48f9d 100644
--- a/lib/psych/visitors/to_ruby.rb
+++ b/lib/psych/visitors/to_ruby.rb
@@ -52,6 +52,9 @@ module Psych
           o.value.unpack('m').first
         when '!str', 'tag:yaml.org,2002:str'
           o.value
+        when '!ruby/object:BigDecimal'
+          require 'bigdecimal'
+          BigDecimal._load o.value
         when "!ruby/object:DateTime"
           require 'date'
           @ss.parse_time(o.value).to_datetime
diff --git a/lib/psych/visitors/yaml_tree.rb b/lib/psych/visitors/yaml_tree.rb
index 523ad77..f373966 100644
--- a/lib/psych/visitors/yaml_tree.rb
+++ b/lib/psych/visitors/yaml_tree.rb
@@ -214,6 +214,10 @@ module Psych
         end
       end
 
+      def visit_BigDecimal o
+        @emitter.scalar o._dump, nil, '!ruby/object:BigDecimal', false, false, Nodes::Scalar::ANY
+      end
+
       def binary? string
         string.encoding == Encoding::ASCII_8BIT ||
           string.index("\x00") ||