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

##</code><code>##

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