Go golang uint64 to bytes, bytes to uint64

main.go

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package main

import (
	"fmt"
	"math/big"
)

func main() {
	b := new(big.Int)
	b.SetUint64(1337)
	v := b.Bytes()

	fmt.Println(v)
	n := int(big.NewInt(0).SetBytes(v).Uint64())

	fmt.Println(n)
}