[druntime] TypeInfo.getHash problems

[bearophile]

H. S. Teoh:

> I found the following bugs with the current implementations of getHash
> in the various TypeInfo classes:

Maybe there are other bugs you have not found yet.
In my opinion this is an important topic (some of the bugs listed here have wasted lot of my time, and generally those limits/bugs reduce the usefulness and safety of the built-in AAs significantly).

Bye,
bearophile