Scalar casts are still allowed (for now), because there's a huge amount
of false positives. Ditto for invalid array offsets.
Thoughts about the rest: luckily, many false positives with array offsets
have gone. Moreover, since *Internal issues are suppressed in the base
config, we can remove inline suppressions.
Unfortunately, there are a couple of new issues about array additions
with only false positives, because apparently they don't take
branches into account.
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