From: Adam Prescott <adam@...>
Date: 2013-06-04T06:49:34+09:00
Subject: Re: Longer user input?

On 3 June 2013 22:37, Zeil Era <lists@ruby-forum.com> wrote:
> It's not an assumption, I have tested it. After typing 254 (or so)
> characters, you can't type anymore. Simple as that.

You might be reaching a limitation with the terminal you're using.
Ruby doesn't care:

$ echo {1..1000} | wc -c
3893
$ echo {1..1000} | ruby -e 'puts STDIN.gets' | wc -c
3893