Calculate "inserted_count"

[nfg]

Hello! I wrote some unit test code like

my $res = $collection->insert_many(\@test_data);
is($res->inserted_count, 3, 'Inserted three records');

And, weirdly, got undef back. According to $res->inserted, I successfully inserted three records. I looked at the code, and couldn't find anywhere that "inserted_count" was actually being set. And so, voila.

Let me know if there's anything I should change.

Cheers!

[xdg]

Thanks! I'll check it out tomorrow.

[xdg]

Great catch and thank you for the PR! I've merged it to master and will
backport it for a 1.2.x bugfix release at the end of the current sprint.

[nfg]

That's awesome, thanks! :-D