code: public static <R> LongFunction<R> softenLongFunction(final CheckedLongFunction<R> fn) {
          return t -> {
              try {
                  return fn.apply(t);
              } catch (final Throwable e) {
                  throw throwSoftenedException(e);
              }
          };
      }
docs: Soften a CheckedLongFunction that can throw Checked Exceptions to a standard LongFunction that can also throw Checked Exceptions (without declaring them)
  
  e.g.
  
  <pre>
  {@code
  long loaded = ExceptionSoftener.softenFunction(this::load).applyHKT(id);
  
  public long load(long it) throws IOException
  </pre>
  
  @param fn CheckedLongFunction to be converted to a standard LongFunction
  @return LongFunction that can throw checked Exceptions