# forge.testing.stable_fields

```python
forge.testing.stable_fields() -> dict[str, tuple[str, ...]]
```

The fields a run's snapshot keeps, by section, in the order the snapshot writes them.

The engine's own numbering (trade, fill and order ids, and the ``flags`` map) is not stable
between
versions of the engine and is left out. ``refusals`` is each refusal's name and count, sorted by
name, and ``end_reason`` is one value.

Since Forge API 1.