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api-guidelines/core-principles/rules-for-extending.md
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Rules for Extending

Any change to an existing API design MUST avoid breaking changes and MUST maintain backward compatibility.

In particular any change to an API design MUST follow the following Rules for Extending:

  1. You MUST NOT take anything away (related: Minimal Surface Principle , Robustness Principle)
  2. You MUST NOT change processing rules
  3. You MUST NOT make optional things required
  4. Anything you add MUST be optional (related Robustness Principle)