I agree with your arguments that this is an adoption barrier. However it would be pity to abandon that style only because it is a barrier. Perhaps, introductory documents and examples indeed shall feature only the usual indentation, while formatting of all other code would be up to the programmers involved.

On the side note, even though having multiple predicates is perfectly viable, it is very rarely needed.

In reply to Re^4: IO::Lambda: call for participation by dk
in thread IO::Lambda: call for participation by dk

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