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Update api-conventions.md 

Moved compatibility gotchas to api_changes.md
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Brian Grant 2017-03-23 14:58:05 -07:00 committed by GitHub
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contributors/devel/api-conventions.md
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@ -1463,22 +1463,6 @@ be less than 256", "must be greater than or equal to 0". Do not use words
like "larger than", "bigger than", "more than", "higher than", etc. like "larger than", "bigger than", "more than", "higher than", etc.
* When specifying numeric ranges, use inclusive ranges when possible. * When specifying numeric ranges, use inclusive ranges when possible.
## Backward compatibility gotchas
* A single feature/property cannot be represented using multiple spec fields in the same API version
simultaneously. Only one field can be populated in any resource at a time, and the client
needs to be able to specify which field they expect to use (typically via API version),
on both mutation and read. Old clients must continue to function properly while only manipulating
the old field. New clients must be able to function properly while only manipulating the new
field.
* Changing any validation rules always has the potential of breaking some client, since it changes the
assumptions about part of the API, similar to adding new enum values. Validation rules on spec fields can
neither be relaxed nor strengthened. Strengthening cannot be permitted because any requests that previously
worked must continue to work. Weakening validation has the potential to break other consumers and generators
of the API resource. Status fields whose writers are under our control (e.g., written by non-pluggable
controllers), may potentially tighten validation, since that would cause a subset of previously valid
values to be observable by clients.
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