comark/code/invalid-start-line · Write startLineNumber as a whole number

startLineNumber sets the number of a block's first line, so an excerpt can keep the numbers it has in its file. Anything but a whole number, such as L120 or 120.5, is ignored, and the lines are numbered from 1.

Incorrect

```js startLineNumber=L120
feedDucks(pond);
```

lint-comark example.mdexample.md:1:1 comark/code/invalid-start-lineThe js code block that starts "feedDucks(pond);" has startLineNumber=L120, which isn't a whole number, so its lines are numbered from 1.Write one such as startLineNumber=120.✖ 1 problem

Correct

```js startLineNumber=120
feedDucks(pond);
```

lint-comark example.md✔ No problems