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# new MyModule({arg1 => 'val1', arg2 => 'val2'})
sub new {
...
    croak('oh crap!') if ref($_[0]) != 'HASH'
    my %args = %{$_[0]};
}

# new MyModule(arg1 => 'val1', arg2 => 'val2')
sub new {
...
    croak('oh crap!') if @_ % 2;
    my %args = @_;
}