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my (
    $self, 
    #@type Foo::Bar
...
    #@type Foo::Baz
    $foobaz
) = @_;

#@returns Some::Class
#@arg $arg1 Foo::Bar    # some description
#@arg $arg2 Foo::Baz    
...
sub somesub{
    my ($self, $arg1, $arg2, $arg3, %args) = @_;
}

#@arg [$var1 HashRef[Foo::Bar]] # description
or
#@arg optional $var1 HashRef[Foo::Bar] # description
or 
#@oarg $var1 HashRef[Foo::Bar] # description