code: public static LongPredicate softenLongPredicate(final CheckedLongPredicate fn) {
          return t -> {
              try {
                  return fn.test(t);
              } catch (final Throwable e) {
                  throw throwSoftenedException(e);
              }
          };
      }
docs: Soften a CheckedLongPredicate that can throw Checked Exceptions to a standard LongPredicate that can also throw Checked Exceptions (without declaring them)
  
  e.g.
  
  <pre>
  {@code
  boolean loaded = ExceptionSoftener.softenLongPredicate(this::exists).test(id);
  
  public boolean exists(long id) throws IOException
  </pre>
  
  @param fn CheckedLongPredicate to be converted to a standard LongPredicate
  @return LongPredicate that can throw checked Exceptions