wrapper: Add modular arithmetic functions to ArbitraryPrecisionInteger #284
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Motivation
A number of higher level schemes we'd like to be able to express make use of modular arithmetic with big integers.
Modifications
This PR adds more internal (package-visible) functions to
ArbitraryPrecisionInteger:ArbitraryPrecisionInteger.modulo(_ mod: ArbitraryPrecisionInteger, nonNegative: Bool = false) throws -> ArbitraryPrecisionIntegerArbitraryPrecisionInteger.inverse(modulo mod: ArbitraryPrecisionInteger) throws -> ArbitraryPrecisionIntegerArbitraryPrecisionInteger.add(_ rhs: ArbitraryPrecisionInteger, modulo modulus: ArbitraryPrecisionInteger? = nil) throws -> ArbitraryPrecisionIntegerArbitraryPrecisionInteger.sub(_ rhs: ArbitraryPrecisionInteger, modulo modulus: ArbitraryPrecisionInteger? = nil) throws -> ArbitraryPrecisionIntegerArbitraryPrecisionInteger.mul(_ rhs: ArbitraryPrecisionInteger, modulo modulus: ArbitraryPrecisionInteger? = nil) throws -> ArbitraryPrecisionIntegerResult
No API change; just more internal functionality we can use.