sent       map[reflect.Type]typeId // which types we've already sent
	countState *encoderState           // stage for writing counts
	freeList   *encoderState           // list of free encoderStates; avoids reallocation
	byteBuf    encBuffer               // buffer for top-level encoderState
	err        error
}

// Before we encode a message, we reserve space at the head of the

import (
	"reflect"
)

`

const arrayHelper = `
func enc%[2]sArray(state *encoderState, v reflect.Value) bool {
	// Can only slice if it is addressable.
	if !v.CanAddr() {
		return false
	}
	return enc%[2]sSlice(state, v.Slice(0, v.Len()))
}
`

const sliceHelper = `
func enc%[2]sSlice(state *encoderState, v reflect.Value) bool {
	slice, ok := v.Interface().([]%[1]s)
	if !ok {