P256K UInt256 addMod(_:modulus:) Instance Method addMod(_:modulus:) Returns (self + other) % modulus. iOS 18.0+ macCatalyst 18.0+ macOS 15.0+ tvOS 18.0+ visionOS 2.0+ watchOS 11.0+ func addMod(_ other: UInt256, modulus: UInt256) -> UInt256 Discussion Requires modulus >= 2.