新增于: v26.8.0
tty.ReadStream 当前的原始模式。当流处于默认模式时为 false，启用原始输入模式时为 'raw'，启用二进制安全 I/O 模式时为 'io'。
🌐 The current raw mode for the tty.ReadStream. This is false when the stream
is in its default mode, 'raw' when raw input mode is enabled, and 'io' when
binary-safe I/O mode is enabled.