Parsing a stream of concatenated JSON documents

I'm trying to parse a stream of concatenated JSON documents like

```
{"x":"y"}{"x":"y"}{"x":"y"}
```

Is there some way to get an event at the boundaries between JSON documents, so I could process each separately?

The issue names no file, test, or entry point. Start by reading the streaming parser API and checking how it handles the end of one top-level JSON value; define the expected boundary behavior for the concatenated example, then verify it with a focused parser test.

Written by the indexing model from the issue text.