IO::Hexdump#read is returning (Int32 | Int64) instead of Int32

[caspiano]

This stack trace is produced from some code tested against nightly.

Looks like the annotation here is incorrect, or an Int64 is slipping in somewhere.

[caspiano]

Here's another failing CI run with the same error, but different stack trace.

[straight-shoota]

This is caused by #10575 (or #10580 more specifically) which adds lots of useful type restrictions. This seems to be one of the few cases where this causes an issue. For the time being, we should simply revert all restrictions that cause any trouble. The hard part is identifying them.
Theoretically, we could just revert all those PRs and make sure to review them more carefully. But I think that would be too drastic. The error rate is really low.

I think I'll go through all the PRs again and try to identify any methods that might be problematic as well. The most likely trouble makers are probably integer type restrictions.

[straight-shoota]

Actually, maybe we should just cast to Int32 instead. I mean, we really want unified return types for any IO#read implementation.

This can probably wait until after 1.1 and reverting this is cheap for a quick fix.

[caspiano]

There’s no type restriction on IO#read (@io in the class is not a more specific subclass of IO), so I would wait for that instead of casting.