IO.select with single argument detected RB-DS1003
Bug risk
Major
IO.select statements can get very hard to make them compatible with Ruby 3 scheduler. It is recommended to use wait_readable or wait_writable on an IO object with a given timeout instead of rescuing an IO::WaitReadable or IO::WaitWritable error and using IO.select in the block.
Bad practice
IO.select([io], [], [], timeout)
Recommended
io.wait_readable(timeout)
Bad practice
IO.select([], [io], [], timeout)
Recommended
io.wait_writable(timeout)