Background

Python's built-in json library can handle encoding dictionaries with keys that aren't strings by coercing them to strings implicitly. The orjson library requires the keys to be strings, otherwise an error is raised.

This would very rarely come up in plotly figures. But now that we're updating Dash (for Dash 2) to use the active plotly.py json engine, it comes up on occasion.

Change

All dict keys are converted to strings during the existing cleaning pass that is used prior to orjson encoding.

Tests

Test added that encodes a dict with integer keys.