Let me try to toss-in an explanation of the big picture here:
(1) In Perl, an “object” is (usually...) a hashref that has been passed to the built-in function, bless, which takes as its (usually...) two parameters the hashref to be blessed and a package name. Internally, Perl now flips a switch that says that it is “blessed,” and associates the specified package-name with it. (Yes, it can be, and occasionally is, re-blessed, which changes the associated package-name.)
Any piece of code which serves this function, no matter where it is located nor what it is named, serves this purpose. Specifically, there is nothing “magical” about a function named new.
(2) When something has been blessed, it becomes possible to use the $obj->methodname(args...) syntax. This simply translates to a subroutine call, to a sub (maybe...) found in the previously-associated package, but passing $obj as an additional, first, parameter.
You will therefore find that these subroutines begin with a statement such as my $self = shift;, which grabs that first-parameter that has been added. Once again, the name $self is simply a convention.
HTH... If you are used to looking at very formal, computer-science-y language implementations, you might be a bit startled by Perl.
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