for nt := 1; nt <= maxTypes; nt *= 10 {
		// Pre-warm a cache of size nt.
		clearCache()
		for _, t := range types[:nt] {
			cachedTypeFields(t)
		}
		b.Run(fmt.Sprintf("HitTypes%d", nt), func(b *testing.B) {
			b.RunParallel(func(pb *testing.PB) {
				for pb.Next() {
					cachedTypeFields(types[0])
				}
			})
		})
	}
}

func BenchmarkEncodeMarshaler(b *testing.B) {
	b.ReportAllocs()

		return field{}, false
	}
	return fields[0], true
}

var fieldCache struct {
	sync.RWMutex
	m map[reflect.Type][]field
}

// cachedTypeFields is like typeFields but uses a cache to avoid repeated work.
func cachedTypeFields(t reflect.Type) []field {
	fieldCache.RLock()
	f := fieldCache.m[t]
	fieldCache.RUnlock()
	if f != nil {
		return f
	}

	// Compute fields without lock.

		return field{}, false
	}
	return fields[0], true
}

var fieldCache sync.Map // map[reflect.Type]structFields

// cachedTypeFields is like typeFields but uses a cache to avoid repeated work.
func cachedTypeFields(t reflect.Type) structFields {
	if f, ok := fieldCache.Load(t); ok {
		return f.(structFields)
	}
	f, _ := fieldCache.LoadOrStore(t, typeFields(t))

				d.skip()
				return nil
			}
		}
		if v.IsNil() {
			v.Set(reflect.MakeMap(t))
		}
	case reflect.Struct:
		fields = cachedTypeFields(t)
		// ok
	default:
		d.saveError(&UnmarshalTypeError{Value: "object", Type: t, Offset: int64(d.off)})
		d.skip()
		return nil
	}

	var mapElem reflect.Value
	var origErrorContext errorContext