import (
    "github.com/torusresearch/bijson"
    "math/big"
    "fmt"
)

func main() {
	var jsonBlob = []byte(`[
	{"Num": "9",   "PtrNum": "FF"},
	{"Num": "3",   "PtrNum": "1"}
    ]`)
	type NumStruct struct {
		Num    big.Int
		PtrNum *big.Int
	}
	var numStructs []NumStruct
	err := Unmarshal(jsonBlob, &numStructs)
	if err != nil {
		fmt.Println("error:", err)
	}
	fmt.Printf("%+v", numStructs)
	// Output:
	// [{Num:{neg:false abs:[9]} PtrNum:+255} {Num:{neg:false abs:[3]} PtrNum:+1}]
}