export function encodeRFC5987ValueChars(str: string): string {
    return encodeURIComponent(str).
        // Note that although RFC3986 reserves "!", RFC5987 does not,
        // so we do not need to escape it
        replace(/['()*]/g, c => "%" + c.charCodeAt(0).toString(16)). // i.e., %27 %28 %29 %2a (Note that valid encoding of "*" is %2A
        // which necessitates calling toUpperCase() to properly encode)
        // The following are not required for percent-encoding per RFC5987,
        // so we can allow for a little better readability over the wire: |`^
        replace(/%(7C|60|5E)/g, (str, hex) => String.fromCharCode(parseInt(hex, 16)));
}