我用自定義的編碼器替換了我的 uber-zap 記錄器的編碼器，以在每個日志條目前加上 SystemD 友好的錯誤級別 ( <LEVEL>)，但是現在在我使用帶有附加字段 ( With(fields ...Field)) 的記錄器后，自定義的前置就消失了：package mainimport (    "os"    "go.uber.org/zap"    "go.uber.org/zap/buffer"    "go.uber.org/zap/zapcore")func getConfig() zap.Config {    // your current config options    return zap.NewProductionConfig()}type prependEncoder struct {    // embed a zapcore encoder    // this makes prependEncoder implement the interface without extra work    zapcore.Encoder    // zap buffer pool    pool buffer.Pool}// EncodeEntry implementing only EncodeEntryfunc (e *prependEncoder) EncodeEntry(entry zapcore.Entry, fields []zapcore.Field) (*buffer.Buffer, error) {    // new log buffer    buf := e.pool.Get()    // prepend the JournalD prefix based on the entry level    buf.AppendString(e.toJournaldPrefix(entry.Level))    buf.AppendString(" ")    // calling the embedded encoder's EncodeEntry to keep the original encoding format    consolebuf, err := e.Encoder.EncodeEntry(entry, fields)    if err != nil {        return nil, err    }    // just write the output into your own buffer    _, err = buf.Write(consolebuf.Bytes())    if err != nil {        return nil, err    }    return buf, nil}// some mapper functionfunc (e *prependEncoder) toJournaldPrefix(lvl zapcore.Level) string {    switch lvl {    case zapcore.DebugLevel:        return "<7>"    case zapcore.InfoLevel:        return "<6>"    case zapcore.WarnLevel:        return "<4>"    }    return ""}func main() {    cfg := getConfig()    // constructing our prependEncoder with a ConsoleEncoder using your original configs    enc := &prependEncoder{        Encoder: zapcore.NewConsoleEncoder(cfg.EncoderConfig),        pool:    buffer.NewPool(),    }我得到的輸出是：<6> 1.640656130756576e+09   info    this is info<7> 1.640656130756611e+09   debug   this is debug<4> 1.640656130756615e+09   warn    this is warn1.6406561307566311e+09  info    this does not have the prefix :(    {"foo": "bar"}我究竟做錯了什么？