my $param = shift;
...
$self->{$_call} = $_param || return $self->{$_call};
I assume $param and $_param were supposed to be the same.
That's a little obfuscated, and doesn't allow setting parameters to false values. A more typical way to do it is:
# (after shifting everything but param)
if (@_) {
return $self->{$_call} = shift;
} else {
return $self->{$_call};
}
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