Go: Convert rune slice (array) to string

Converting a slice of runes to a string yields a string that is the concatenation of the runes converted to UTF-8 encoded strings.

Values outside the range of valid Unicode code points are converted to \uFFFD, the Unicode replacement character.

r := []rune{'\u0061', '\u0062', '\u0063', '\u65E5', -1}
s := string(r)
// Output: abc日�