assertThat(caughtEe).hasCauseThat().isSameInstanceAs(ee);

    caughtUee =
        assertThrows(
            UncheckedExecutionException.class, () -> cacheChecked.getUnchecked(new Object()));
    assertThat(caughtUee).hasCauseThat().isSameInstanceAs(ee);

    cacheChecked.refresh(new Object());
    checkLoggedCause(ee);

    caughtEe =

          "ledger-enquirer.com",
          "members.blah.nl.",
          "pvt.k12.ca.us",
          "site.ac.jp",
          "site.ad.jp",
          "site.cc",
          "site.ed.jp",
          "site.ee",
          "site.fi",
          "site.fm",
          "site.geo.jp",
          "site.go.jp",
          "site.gr",
          "site.gr.jp",
          "site.jp",
          "site.lg.jp",

     * java.util.regex (where we want them in order to avoid catastrophic backtracking).
     */
    String decimal = "(?:\\d+#(?:\\.\\d*#)?|\\.\\d+#)";
    String completeDec = decimal + "(?:[eE][+-]?\\d+#)?[fFdD]?";
    String hex = "(?:[0-9a-fA-F]+#(?:\\.[0-9a-fA-F]*#)?|\\.[0-9a-fA-F]+#)";
    String completeHex = "0[xX]" + hex + "[pP][+-]?\\d+#[fFdD]?";

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