in reply to implicit sort disables a chained subroutine?

Ahh, but you're not using the default comparator block. sort has three prototypes:

USERSUB, if given, is the name of a subroutine that returns an integer less than, equal to, or greater than 0, depending on how the elements of the list are to be ordered.

You're going to have to add the BLOCK there because you'll never get the third prototype.

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