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- API version: every path starts with
/v1. Within v1 we only add: new operations, new optional parameters,
new response fields. Removing or renaming anything needs a new version, announced in advance.
- Engine version: every JSON response carries
meta.engine_version. It changes when a calculation changes, even
if the response shape does not.
- Calculation changes are listed separately in the changelog (with an RSS feed):
what changed, why, and which results move. Store
engine_version with results you keep, so you know which rules
produced them.
