const math/big.ToZero

4 uses

	math/big (current package)
		float.go#L138: 	ToZero                            // == IEEE 754-2008 roundTowardZero
		float.go#L461: 		case ToZero:
		roundingmode_string.go#L13: 	_ = x[ToZero-2]

	go/constant
		value.go#L883: 			t.SetMode(big.ToZero)