Do you mean these four lines belonged to Foo are calling class method instead of object method? Therefore no object is created by them, right?

__PACKAGE__->hello('test1');
Foo->hello('test2');
hello(__PACKAGE__, 'text3');
hello('Foo', 'text4');
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However, if I call this line:

Foo->new()->hello('test5');
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one object will be created. Am I right so far?
Thanks.