Allow comments in JSON data passed to JSON.parse(…).

Comments help annotate configuration or localisation files, which are stored in the JSON file format.

The fact that they were removed from the JSON specification simply because Douglas Crockford didn't like them is a terrible reason, and an overwhelming majority of web developers agree that removing them was dumb.

Many JSON parsers already support comments, with the JSON parser built into ECMAScript being part of a minority of JSON parsers that don't support comments.

/*
 * Multi-line comment
 */
{
	// Single-line comment
	"foo": "bar"
}