public static Option <R> Map <T, R>(this Option <T> self, Func <T, R> Some, Func <R> None) =>
self.IsSome
? OptionCast.Cast(Some(self.Value))
: None();
public static Option <R> Map <T, R>(this Option <T> self, Func <T, R> mapper) =>
self.IsSome
? OptionCast.Cast(mapper(self.Value))
: None;