func (Encoder) AppendBeginMarker(dst []byte) []byte {
	return append(dst, '{')
}
AppendBeginMarker inserts a map start into the dst byte array.
package json
import (
	"encoding/json"
	"fmt"
	"math"
	"net"
	"strconv"
)
func (Encoder) AppendNil(dst []byte) []byte {
	return append(dst, "null"...)
}