unleash.unleash/docs/dev/version-4.md

# Version 4 specifications

Here we document features planned for Unleash version 4 and progress for each client SDK. Client SDKs should be able to introduce all features as a minor rev 3. release, and should switch to a version 4.x revision when all features are supported. This makes it easier for the Users to navigate supported features in respecitve clients.

| Feature | Node.js | Java | Python | Ruby | Go | .Net | Client Specifications |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Static context fields (#442) | :heavy_check_mark: | :heavy_check_mark: | :heavy_check_mark: |  |  |  |  |
| Strategy constraints (#442) | :fire: | :fire: |  |  |  |  |  |
| Flexible rollout strategy (#442) | :fire: | :fire: |  |  |  |  |  |
| Variant support ([docs](../feature-toggle-variants.md)) | :heavy_check_mark: | :heavy_check_mark: |  | :heavy_check_mark: |  |  | :heavy_check_mark: |