I recently incorporated tracing-bunyan-formatter into a project, and found it triggered a regression error in deserializing an untagged enum with serde_json.

tracing-bunyan-formatter enables the arbitrary-precision field on serde-json, which causes the bug, as explained here: serde-rs/json#559

For what it's worth, I pulled down this crate and, and the same test fails with and without the feature (parent_properties_are_propagated).

EDIT:

Also, let me know if it's inappropriate for me to to notify you of a bug in another crate. I figured since it affects your users, you'd want to know.