@Override
  public @NotNull String getDemoText() {
    return """
      {
        // Line comments are not included in standard but nonetheless allowed.
        /* As well as block comments. */
        <propertyKey>"the only keywords are"</propertyKey>: [true, false, null],
        <propertyKey>"strings with"</propertyKey>: {
          <propertyKey>"no escapes"</propertyKey>: "pseudopolinomiality"
          <propertyKey>"valid escapes"</propertyKey>: "C-style\\r\\n and unicode\\u0021",
          <propertyKey>"illegal escapes"</propertyKey>: "\\0377\\x\\"
        },
        <propertyKey>"some numbers"</propertyKey>: [
          42,
          -0.0e-0,
          6.626e-34
        ]\s
      }""";
  }
@Override
  public @NotNull String getDemoText()