Psalm: Enable totallyTyped=true and bump type coverage to 100% #94
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This PR enforce a little more checks with Psalm
I had to ignore three errors. Two have the same cause: the library doesn't always check ArrayIterator::valid() before calling ArrayIterator::current so it can get a null value. This is not expected by Psalm. It's sort of false positive but caused by a bad practice...
The third I think is legitimate but I didn't take the time to prove it so I'll ignore it for now.