Explore: IO#timeout to get rid of BufferedIO

[byroot]

The whole point of BufferedIO is to be able to perform IO#gets with a timeout. But it requires to copy and slices lots of strings, even though Ruby IOs already have an internal buffer.

Ruby 3.2 introduced IO#timeout, and it applies to gets among other. If it works properly we might be able to get rid of this second layer of buffering in 3.2+.

Things to check:

• gets
• getbyte
• SSLSocket?

If it does work, some other gems may benefit from it, e.g. Net::HTTP etc.