math/big: Int.Exp returns ±1 whenever the exponent is <= 0 #4239
Description
What steps will reproduce the problem?
1. Run
package main
import (
"fmt"
"math/big"
)
func main() {
var z big.Int
z.Exp(big.NewInt(-2), big.NewInt(0), nil)
fmt.Println(&z)
}
What is the expected output? What do you see instead?
Expected: 1
Got: -1
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