The authors of a test tool have unilaterally decided that you [...] are [not] allowed to use a comparator function that they didn't provide,

A more accurate summary would be that a test tool uses a special class as a sentinel and complains if a sentinel value turns up in a place where it has no business being. Meanwhile, a sloppy hack to get around draconian type checking had the side effect of making a non-sentinel appear to be a sentinel. The solution was to make the hack slightly less sloppy.

I would put more blame on the type checking that requires the hack than on the use of an internal class name as a way to create and detect sentinels.

- tye        

In reply to Re^2: Mocking isa under Test::Deep (sentinel) by tye
in thread Mocking isa under Test::Deep by choroba

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