Feature: Optionally use ext-readline to enable raw input mode if available. This extension is entirely optional, but it is more efficient and reliable than spawning the external stty command. (#63 by @clue)

Feature: Consistently return boolean success from write() and avoid sending unneeded control codes between writes (#60 by @clue)

Deprecated: Deprecate input helpers and output helpers and recommend using Stdio as a normal DuplexStreamInterface instead. (#59 and #62 by @clue)

// deprecated
$stdio->on('line', function ($line) use ($stdio) {
    $stdio->writeln("input: $line");
});

// recommended alternative
$stdio->on('data', function ($line) use ($stdio) {
    $stdio->write("input: $line");
});

Improve test suite by adding forward compatibility with PHPUnit 6 (#61 by @carusogabriel)