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31e9569
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IMHO, talking about signatures might not be the best choice to impress people with perl. The fact that they were added in core in 2014 might be seen as a proof that this is a language of the past. Instead you might mention things like closures, tied variables, lvalues, Moose and DBIx::Class.
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Tied variables, being new to some languages, are an old thing in Perl :).
lvalues are also comparatively old thing as the closures too :). Maybe rather it worhs mentionins that some things are long ago not a new feature in perl like closures etc... and mentioning that signatures haven't been needed so far but added only by polular demand... etc...