• byte 实质上就是 uint8 类型。byte 用来强调数据是 raw data，而不是数字；

  • rune 实质上就是 int32 类型。而 rune 用来表示 Unicode 的 code point。

    uint8       the set of all unsigned  8-bit integers (0 to 255)
int32       the set of all signed 32-bit integers (-2147483648 to 2147483647)

byte        alias for uint8
rune        alias for int32

    // byte is an alias for uint8 and is equivalent to uint8 in all ways. It is
// used, by convention, to distinguish byte values from 8-bit unsigned
// integer values.
type byte = uint8

// rune is an alias for int32 and is equivalent to int32 in all ways. It is
// used, by convention, to distinguish character values from integer values.
type rune = int32