func prefixu8(b []byte, pre byte, sz uint8) {
	b[0] = pre
	b[1] = byte(sz)
}
/* -----------------------------
prefix utilities
-----------------------------
write prefix and uint8
package msgp
func putMint64(b []byte, i int64) {
	b[0] = mint64
	b[1] = byte(i >> 56)
	b[2] = byte(i >> 48)
	b[3] = byte(i >> 40)
	b[4] = byte(i >> 32)
	b[5] = byte(i >> 24)
	b[6] = byte(i >> 16)
	b[7] = byte(i >> 8)
	b[8] = byte(i)
}
func getMint64(b []byte) int64 {
	return (int64(b[1]) << 56) | (int64(b[2]) << 48) |
		(int64(b[3]) << 40) | (int64(b[4]) << 32) |
		(int64(b[5]) << 24) | (int64(b[6]) << 16) |
		(int64(b[7]) << 8) | (int64(b[8]))
}
func putMint32(b []byte, i int32) {
	b[0] = mint32
	b[1] = byte(i >> 24)
	b[2] = byte(i >> 16)
	b[3] = byte(i >> 8)
	b[4] = byte(i)
}
func getMint32(b []byte) int32 {
	return (int32(b[1]) << 24) | (int32(b[2]) << 16) | (int32(b[3]) << 8) | (int32(b[4]))
}
func putMint16(b []byte, i int16) {
	b[0] = mint16
	b[1] = byte(i >> 8)
	b[2] = byte(i)
}
func getMint16(b []byte) (i int16) {
	return (int16(b[1]) << 8) | int16(b[2])
}
func putMint8(b []byte, i int8) {
	b[0] = mint8
	b[1] = byte(i)
}
func getMint8(b []byte) (i int8) {
	return int8(b[1])
}
func putMuint64(b []byte, u uint64) {
	b[0] = muint64
	b[1] = byte(u >> 56)
	b[2] = byte(u >> 48)
	b[3] = byte(u >> 40)
	b[4] = byte(u >> 32)
	b[5] = byte(u >> 24)
	b[6] = byte(u >> 16)
	b[7] = byte(u >> 8)
	b[8] = byte(u)
}
func getMuint64(b []byte) uint64 {
	return (uint64(b[1]) << 56) | (uint64(b[2]) << 48) |
		(uint64(b[3]) << 40) | (uint64(b[4]) << 32) |
		(uint64(b[5]) << 24) | (uint64(b[6]) << 16) |
		(uint64(b[7]) << 8) | (uint64(b[8]))
}
func putMuint32(b []byte, u uint32) {
	b[0] = muint32
	b[1] = byte(u >> 24)
	b[2] = byte(u >> 16)
	b[3] = byte(u >> 8)
	b[4] = byte(u)
}
func getMuint32(b []byte) uint32 {
	return (uint32(b[1]) << 24) | (uint32(b[2]) << 16) | (uint32(b[3]) << 8) | (uint32(b[4]))
}
func putMuint16(b []byte, u uint16) {
	b[0] = muint16
	b[1] = byte(u >> 8)
	b[2] = byte(u)
}
func getMuint16(b []byte) uint16 {
	return (uint16(b[1]) << 8) | uint16(b[2])
}
func putMuint8(b []byte, u uint8) {
	b[0] = muint8
	b[1] = byte(u)
}
func getMuint8(b []byte) uint8 {
	return uint8(b[1])
}
func getUnix(b []byte) (sec int64, nsec int32) {
	sec = (int64(b[0]) << 56) | (int64(b[1]) << 48) |
		(int64(b[2]) << 40) | (int64(b[3]) << 32) |
		(int64(b[4]) << 24) | (int64(b[5]) << 16) |
		(int64(b[6]) << 8) | (int64(b[7]))
	nsec = (int32(b[8]) << 24) | (int32(b[9]) << 16) | (int32(b[10]) << 8) | (int32(b[11]))
	return
}
func putUnix(b []byte, sec int64, nsec int32) {
	b[0] = byte(sec >> 56)
	b[1] = byte(sec >> 48)
	b[2] = byte(sec >> 40)
	b[3] = byte(sec >> 32)
	b[4] = byte(sec >> 24)
	b[5] = byte(sec >> 16)
	b[6] = byte(sec >> 8)
	b[7] = byte(sec)
	b[8] = byte(nsec >> 24)
	b[9] = byte(nsec >> 16)
	b[10] = byte(nsec >> 8)
	b[11] = byte(nsec)
}