def test_hash_string_to_bson_hint # to check overhead of hint setting and passing
    size = 1024
    hash = Hash[*(0..size).to_a.collect{|i| [ ('a' + i.to_s), i.to_s]}.flatten]
    method_label_pairs = [
        [ method(:old_hash_to_bson_no_hint), 'Hash string to_bson no hint', RESET ],