public static L ifRight <L, R>(Either <L, R> either, Func <R, L> leftMap) => either.IfRight(leftMap);
public static L ifRight <L, R>(Either <L, R> either, L leftValue) => either.IfRight(leftValue);
public static L ifRight <L, R>(Either <L, R> either, Func <L> Left) => either.IfRight(Left);
public static Unit ifRight <L, R>(Either <L, R> either, Action <R> Right) => either.IfRight(Right);