call site 4 for path.local.readlines
log/testing/test_log.py - line 122
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   def test_log_file(self):
       custom_log = tempdir.join('log.out')
       py.log.setconsumer("default", open(str(custom_log), 'w', buffering=0))
       py.log.default("hello world #1") 
       assert custom_log.readlines() == ['[default] hello world #1\n']
   
       py.log.setconsumer("default", py.log.Path(custom_log, buffering=0))
       py.log.default("hello world #2") 
->     assert custom_log.readlines() == ['[default] hello world #2\n'] # no append by default!