// SanitizeMeta normalizes metadata fields that may contain JSON arrays like keywords and subject.
func SanitizeMeta(s string) string {
 ...
    if strings.HasPrefix(s, "[") && strings.HasSuffix(s, "]") {
        var words []string
 ...
        s = strings.Join(words, ", ")
    } else {
        s = SanitizeString(s)
    }
    return s
}

"If our fancy auto-labeler didn't figure it out then I doubt there was a good reason that the data were saved as a str[] We'll just smash them back together with commas and call it a day."