BrowserUk,
It isn't silently being bypassed. Put a print statement in uniq() and see for yourself. As far as why built-ins are working, I hope the other responses answer that.

Cheers - L~R

In reply to Re^3: implicit sort disables a chained subroutine? by Limbic~Region
in thread implicit sort disables a chained subroutine? by BrowserUk

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