Wondering why `fs.exists` doesn't comply to async methods pattern and 
doesn't return error as a first argument?

It uses

fs.exists('/etc/passwd', function (exists) {
  util.debug(exists ? "it's there" : "no passwd!");});


Instead of

fs.exists('/etc/passwd', function (err, exists) {
  util.debug(exists ? "it's there" : "no passwd!");});

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