0.008     2014-12-30 22:56:48+08:00 Asia/Shanghai
1. str vs str will be true only if two string is equal
   is_approx('str', 'str', 'str vs str', '1%'); # is true
   
   $got = [ 1, 2, 'strign'];
   $expect = [ 0.999, 2.001, 'string'];
   cmp_deeply( $got, approx($expect, '1%'), 'array element is str');  # is not ok

2. add Test::Builder::Tester to test test

3. fix typo

4. improve document

