{
  // When both string limits are given, the excerpt is the shorter of the
  // two.
  "/options": { maxStringLines: 2, maxStringLength: 8 },

  "cut by the length": "abcdefghij\nkl\nmn",
  "cut by the lines": "ab\ncd\nef",
  "within both": "ab\ncd",
}

--

cut by the length:
"abcdefgh"+...length:16
"abcdefgh" +
  ... length: 16
{
  "/partialString": {
    length: 16,
    excerpt: "abcdefgh"
  }
}

cut by the lines:
"ab\ncd\n"+...length:8
"ab\n" +
  "cd\n" +
  ... length: 8
{
  "/partialString": {
    length: 8,
    excerpt: "ab\n" +
      "cd\n"
  }
}

within both:
"ab\ncd"
"ab\n" +
  "cd"
"ab\n" +
  "cd"