I’m trying to convert text to big.Float, however, as I understand it, the same string 3000 is represented in different byte forms:

[208 151 48 48 48]
[51 48 48 48]

I tried to look at the utf-8 codes for each version of line 3000 using the utf8.DecodeLastRune function:

func printUnicode(str string) {
    b := []byte(str)
    for len(b) > 0 {
        r, size := utf8.DecodeLastRune(b)
        fmt.Printf("%c %vn", r, size)

        b = b[:len(b)-size]
    }
}

I got the following result:

З000
0 1
0 1
0 1
З 2
3000
0 1
0 1
0 1
3 1

that is, the string 3000 has a different size of runes

the problem is that when I try to call function big.ParseFloat for the first version of the string, I get an error:

math/big: cannot unmarshal "З000" into a *big.Float (number has no digits)

what is the reason for this and how to fix it?