Reline doesn't respect EOF from the terminal

Description

When the terminal uses a different control character for EOF, it's not respected by reline.

By comparison with readline:

$ stty eof ^K # stty eof ^D to restore
$ ruby -rreadline -e Readline.readline
a^A^D^D^K

I type a, then ^A to go at the beginning of the line, then ^D to remove the a, the second ^D doesn't do anything, but ^K sends the end-of-file and ends the process.

$ stty eof ^K # stty eof ^D to restore
$ ruby -rreadline -e Readline.readline
a^A^K^K

I type a, then ^A to go at the beginning of the line, then ^K removes until the end of the line (kill-line), the second ^K sends the end-of-file and ends the process.

With reline:

$ stty eof ^K # stty eof ^D to restore
$ ruby -rreline -e Reline.readline
a^A^D^D

I type a, then ^A to go at the beginning of the line, then ^D to remove the a, the second ^D sends the end-of-file and ends the process.

$ stty eof ^K # stty eof ^D to restore
$ ruby -rreline -e Reline.readline
a^A^K^K^D

I type a, then ^A to go at the beginning of the line, then ^K removes until the end of the line (kill-line), the second ^K doesn't do anything, but ^D sends the end-of-file and ends the process.

Terminal Emulator

Terminal.app on macOS 13.1

Start by reproducing the terminal behavior with stty eof ^K and Reline.readline, then trace how Reline.readline handles control characters and EOF. Compare the observed behavior with the readline examples in the issue. Done means the configured terminal EOF character ends the process while the normal delete and kill-line controls retain their expected behavior.