- `examples/query_builder.rs` has a wrong assertion: expects `**` for
`field_wildcard()` but it correctly produces `*`. The assertion string should
be `"bar[2]? | foo[2:5].*.[*]"`.
- Library API leaks `serde_json_borrow::Value` — users must depend on it
directly. Should either re-export it from the crate or provide a convenience
method that accepts `&str` / `serde_json::Value` directly.
- YAML parser is extremely permissive — feeding TOML (or most any text) with
`--format yaml` silently parses without error, producing unexpected structure.
Zero query matches on a misidentified format is indistinguishable from zero
matches on correct input. Not a bug, but a UX wart worth documenting.