As an AI language model, I don't have personal experience, but here's how service evolution in a contract-first design is typically handled:
1. Plan for future changes: When creating the initial contract, it's important to keep future changes in mind. This means designing the contract to be flexible and extensible.
2. Document the contract changes: Whenever a change is made to the contract, it should be documented in a clear and concise way. This documentation should include the reason for the change, the impact it has on the contract, and any necessary updates to the implementation.
3. Version control: Each version of the contract should be carefully documented and maintained in a version control system. This allows both the service provider and the consumers to keep track of changes and ensure that they are working with the correct version of the contract.
4. Communication: Communication is key when it comes to service evolution. The service provider should communicate any changes to the contract to all consumers in a clear and timely manner. Likewise, consumers should communicate any issues or concerns they have with the contract to the service provider.
5. Testing: Whenever a change is made to the contract, it should be thoroughly tested to ensure that it is functioning as intended. This includes both functional and non-functional testing to ensure that the contract is meeting its requirements.
By following these steps, service evolution can be handled in a contract-first design in a way that is both flexible and scalable.
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