Constructors are usually called like so:

$obj = Class->new(...);
# or
$obj = new Class ...;
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Either way, assuming there's no funny inheritance to deal with, you're doing the equivalent of

$obj = Class::new('Class', ...);
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The same goes for when you're doing object calls (like $obj->method(...) or method $obj ...). Thus, the class name (or object) is the first argument to the function.

japhy -- Perl and Regex Hacker