Deep hash clean (with refinements)

	module MyRefinements
	refine Hash do
	def clean!
	self.delete_if do |key, val|
	if block_given?
	yield(key,val)
	else
	# Prepeare the tests
	test1 = val.nil?
	test2 = val === 0
	test3 = val === false
	test4 = val.empty? if val.respond_to?('empty?')
	test5 = val.strip.empty? if val.is_a?(String) && val.respond_to?('empty?')
	# Were any of the tests true
	test1 || test2 || test3 || test4 || test5
	end
	end
	self.each do |key, val|
	if self[key].is_a?(Hash) && self[key].respond_to?('clean!')
	if block_given?
	self[key] = self[key].clean!(&Proc.new)
	else
	self[key] = self[key].clean!
	end
	end
	end
	return self
	end
	end
	end
	Class MyClass
	using MyRefinements
	#start using {}.clean!
	end

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