Multi level symbolizer with tail recursion.

gistfile1.txt

#Example
# Input: {"first1"=>"hi", "first2"=>{"second"=>"gah", "second1"=>{"third1"=>"toot"}, "second2"=>"gah3"}}
# Output: {:first1=>"hi", :first2=>{:second=>"gah", :second1=>{:third1=>"toot"}, :second2=>"gah3"}}

def symbolize(hash)
  toprocess = [hash]
	while h = toprocess.shift
	  h.keys.each do |k|
	    v = h[k]
	    if v.is_a?(Hash)
	      toprocess << v
	    end
	    if k.is_a?(String)
	      h.delete(k)
	      h[k.to_sym] = v
	    end
	  end
	end
	hash
end