Use the built-in type command of the shell to reveal the truth.
使用Shell内置的type命令可以揭示实际的情况。
We recommend that every object of built-in type be initialized.
建议每个内置类型的对象都要初始化。
Whether a variable of built-in type is automatically initialized depends on where it is defined.
内置类型变量是否自动初始化取决于变量定义的位置。
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