var math/big.karatsubaSqrThreshold

4 uses

	math/big (current package)
		nat.go#L525: 	if n&1 != 0 || n < karatsubaSqrThreshold || n < 2 {
		nat.go#L557: var karatsubaSqrThreshold = 260 // computed by calibrate_test.go
		nat.go#L581: 	if n < karatsubaSqrThreshold {
		nat.go#L592: 	k := karatsubaLen(n, karatsubaSqrThreshold)

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