We should keep to the 4 space indentation rule. Allowing 6, 8 or any other number for "personal preference" is an absurd line in a "standard".

Of course, the best rule is keeping your code easy and clean, avoing dozens of parameters to a function ("code smell" for long parameter lists). But sometimes there is no way to avoid functions with 6 parameters, and having default values for them does not simplfy the situation. The rules here are exactly for that code lines.

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