Compatibility level

The level of backwards compatibility of the release.

• No code changes - Documentation and test changes, but not in code.
• Only extensions, no changes - Code extensions but no changes in existing code.
• Code changes, but only internal - Code has changed but should not affect external behavior.
• Code changes, but only bug fixes - Code has changed but only with bug fixes.
• Code changes, may break compatibility - Code has changed and may break clients, but not necessarily.
• Not backwards compatible - Code has changed and breaks compatibility for sure.