If you want to avoid namespace clashes, you can just avoid the method lookup entirely and pass the object as the first parameter to the private method

This option was mentioned several times in the OP you know :-)

Two problems:

• Using a different calling style makes it harder to switch to/from private/public methods since we have to change the way $self is passed
• The method name is still in the main namespace, so subclasses can call it accidentally leading to potentially odd results

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