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Obviously this applies equally with python, bash, sh, etc substituted for perl!
Quentin’s answer below was clearly correct, and so I’ve accepted it, but I guess what I actually meant was ‘what are the pros and cons of the two ways of using #! to invoke perl/python/bash as the interpreter of a script?’
One references a common place that perl is installed. The other references a common place that env is installed and asks it what the path to the default perl is.