See chocolateboy's response in "How to tell apart numeric scalars and string scalars in Perl?" 

use autobox::universal qw(type);

say type("42");  # STRING
say type(42);    # INTEGER
say type(42.0);  # FLOAT 
say type(undef); # UNDEF

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In reply to Re: Distiguishing arguments: number-strings vs real integer by clueless newbie
in thread Distiguishing arguments: number-strings vs real integer by LanX

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