> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt. ## 2.25.0 **`(feat):`** Add `generate-literals` configuration option. When enabled, string and boolean literal properties emit a self-contained `readonly struct` with a built-in `JsonConverter` instead of using a string property with an `Assert` setter. The struct type validates the literal value at the JSON deserialization boundary and supports implicit conversion to `string` or `bool`. The previous `experimental-readonly-constants` option is now deprecated and will log a warning when used. Use `generate-literals` instead. ## 2.24.5 **`(chore):`** Add concurrency configuration to generated CI workflow with cancel-in-progress: false to prevent stacked runs from being cancelled when a newer run starts.