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So the docs don't mention this support anywhere. The 'l' format isn't listed in the table of legacy to Argument Clinic converters, nor is there a list of converters that only exist in Argument Clinic. So unless I read the section on return converters and inferred that if a return converter exists for long it exists as a argument converter I had no way of knowing the existence of long as a converter without reading the code.
So this is at least a doc bug.