var math/big.karatsubaSqrThreshold

4 uses

	math/big (current package)
		natmul.go#L69: var karatsubaSqrThreshold = 80 // see calibrate_test.go
		natmul.go#L90: 	if n < basicSqrThreshold && n < karatsubaSqrThreshold {
		natmul.go#L100: 	if n < karatsubaSqrThreshold {
		natmul.go#L263: 	if n < karatsubaSqrThreshold || n < 2 {