add a recursive_to_h method

making to_h recursive by default breaks #with in an important way.
return to_h to it's old self and add recursive_to_h.

lib/values.rb

@@ -74,7 +74,11 @@ def with(hash = {})
       end
 
       def to_h
-        Hash[to_a.map{|k, v| [k, Value.try_to_h(v)]}]
+        Hash[to_a]
+      end
+
+      def recursive_to_h
+        Hash[to_a.map{|k, v| [k, Value.coerce_to_h(v)]}]
       end
 
       def to_a
@@ -87,12 +91,12 @@ def to_a
 
   protected
 
-  def self.try_to_h(v)
+  def self.coerce_to_h(v)
     case
     when v.is_a?(Hash)
-      Hash[v.map{|hk, hv| [hk, try_to_h(hv)]}]
+      Hash[v.map{|hk, hv| [hk, coerce_to_h(hv)]}]
     when v.respond_to?(:map)
-      v.map{|x| try_to_h(x)}
+      v.map{|x| coerce_to_h(x)}
     when v && v.respond_to?(:to_h)
       v.to_h
     else

spec/values_spec.rb

@@ -193,17 +193,19 @@ def change_color(new_color)
     it 'returns a hash of fields and values' do
       expect(Point.new(1, -1).to_h).to eq({ :x => 1, :y => -1 })
     end
+  end
 
+  describe '#recursive_to_h' do
     it 'converts nested values' do
-      expect(Rectangle.new(Point.new(0, 1), Point.new(1, 0)).to_h).to eq({:top_left => {:x => 0, :y => 1}, :bottom_right => {:x => 1, :y => 0}})
+      expect(Rectangle.new(Point.new(0, 1), Point.new(1, 0)).recursive_to_h).to eq({:top_left => {:x => 0, :y => 1}, :bottom_right => {:x => 1, :y => 0}})
     end
 
     it 'converts values in an array field' do
-      expect(Board.new([Cell.new(false), Cell.new(true)]).to_h).to eq({:cells => [{:alive => false}, {:alive => true}]})
+      expect(Board.new([Cell.new(false), Cell.new(true)]).recursive_to_h).to eq({:cells => [{:alive => false}, {:alive => true}]})
     end
 
     it 'converts values in a hash field' do
-      expect(Board.new({:mine => Cell.new(true), :yours => Cell.new(false)}).to_h).to eq({:cells => {:mine => {:alive => true}, :yours => {:alive => false}}})
+      expect(Board.new({:mine => Cell.new(true), :yours => Cell.new(false)}).recursive_to_h).to eq({:cells => {:mine => {:alive => true}, :yours => {:alive => false}}})
     end
   end