Why is rune in golang an alias for int32 and not uint32?

Question

The type rune in Go is defined as

an alias for int32 and is equivalent to int32 in all ways. It is used, by conv

Answer 1

I googled and found this

This has been asked several times. rune occupies 4 bytes and not just one because it is supposed to store unicode codepoints and not just ASCII characters. Like array indices, the datatype is signed so that you can easily detect overflows or other errors while doing arithmetic with those types.