My solution

ruby_solution.rb

@@ -3,7 +3,41 @@
 def refineParameters input
   # If you want to use the input file before running the tests, uncomment the following line
   # input = JSON.parse(File.read(File.join(File.dirname(File.absolute_path(__FILE__)), 'tests/challenge.json')))
+
+  output = parseHash(input)
 
   # Write your code here.
-  return input
+  return output
+end
+
+def parseHash(hash)
+  hash.each do |k, v|
+    if(v.is_a?(Hash))
+      hash[k] = parseHash(v)
+    elsif(v.is_a?(Array))
+      v = v.map do |subValue|
+        convertType(subValue)
+      end
+
+      hash[k] = v
+    else
+      hash[k] = convertType(v)
+    end
+  end
+
+  hash
+end
+
+def convertType(value)
+  if( value.casecmp("true") == 0)
+    true
+  elsif ( value.casecmp("false") == 0)
+    false
+  elsif ((value.to_i != 0 || value == "0") && !value.include?("-"))
+    # to_i returns 0 if it can't parse the string. Checking for - means
+    # dates don't get automatically converted
+    value.to_i
+  else
+    value
+  end
 end