如题,golang中为何类型rune是int32的别名,而不是uint32?搜了一下解释没太懂([why-is-rune-in-golang-an-alias-for-int32-and-not-uint32](https://stackoverflow.com/questions/24714665/why-is-rune-in-golang-an-alias-for-int32-and-not-uint32?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa)),望大佬解惑
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