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@@ -1,5 +1,7 @@
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 *SVN*
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+* Serialize BigDecimals as Floats when using to_yaml. #8746 [ernesto.jimenez]
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+
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 * Adding TimeWithZone #to_yaml, #to_datetime, #eql? and method aliases for duck-typing compatibility with Time [Geoff Buesing]
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 * TimeWithZone #in_time_zone returns +self+ if zone argument is the same as #time_zone [Geoff Buesing]

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@@ -1,6 +1,29 @@
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+require 'yaml'
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+
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 class BigDecimal #:nodoc:
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   alias :_original_to_s :to_s
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   def to_s(format="F")
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     _original_to_s(format)
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   end
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+
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+  yaml_as "tag:yaml.org,2002:float"
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+  def to_yaml( opts = {} )
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+    YAML::quick_emit( nil, opts ) do |out|
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+      # This emits the number without any scientific notation.
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+      # I prefer it to using self.to_f.to_s, which would lose precision.
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+      #
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+      # Note that YAML allows that when reconsituting floats
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+      # to native types, some precision may get lost.
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+      # There is no full precision real YAML tag that I am aware of.
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+      str = self.to_s
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+      if str == "Infinity"
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+        str = ".Inf"
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+      elsif str == "-Infinity"
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+        str = "-.Inf"
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+      elsif str == "NaN"
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+        str = ".NaN"
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+      end
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+      out.scalar( "tag:yaml.org,2002:float", str, :plain )
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+    end
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+  end
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 end