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Last updated Nov 18, 2025
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Smithy will be doing a minor version bump of the IDL to introduce new syntax features. This milestone will be used to track what will be included, though the final set of features is not yet set in stone.

What is in scope?

This release may include new IDL syntax features, such as byte strings, that do not break any existing features.

What is not in scope?

  • Any sort of breaking changes to the semantic model.
  • Any changes to the AST except for the acceptance of the 2.1 version. The intent of this release is to provide features to model writers without disrupting model consumers.

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