Seems like it'd be less work to write:
sub new
{
croak "new() called as a function, not a method\n" unless @_;
bless {}, shift;
}
If you really want to be paranoid, though, you should make something similar a precondition of all of your methods. (For convenience sake of everyone else, though, please use [CPAN://Scalar::Util]::blessed(). Also, you ought to call isa() directly, not through UNIVERSAL::, in case someone overrides it.
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