// Payload size can give an indication of expected payload size.
// If plSize is <= 0 it will be calculated.
func (x *xlMetaInlineData) serialize(plSize int, keys [][]byte, vals [][]byte) {
	if len(keys) != len(vals) {
		panic(fmt.Errorf("xlMetaInlineData.serialize: keys/value number mismatch"))
	}
	if len(keys) == 0 {
		*x = nil
		return
	}
	if plSize <= 0 {
		plSize = 1 + msgp.MapHeaderSize
		for i := range keys {