Personally, I like the leading underscores. What I don't like is CamelCase... instead of _somePrivateMethod, I'd use _some_private_method.

Putting all private methods together after the public methods would be just nonsense. What's easier to read, alternative 1:

sub function1 {
  #...
}

sub _aux_function1 {
  #...
}

sub function2 {
  #...
}

sub _aux_function2 {
  #...
}

sub function3 {
  #...
}

sub _aux_function3 {
  #...
}
[download]

Or alternative 2:

sub function1 {
  #...
}

sub function2 {
  #...
}

sub function3 {
  #...
}

sub _aux_function1 {
  #...
}

sub _aux_function2 {
  #...
}

sub _aux_function3 {
  #...
}
[download]

And if you're still not convinced, try with a larger example, preferably with pod in the middle.

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