> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt. ## 1.0.0-rc87 **`(feat):`** Add support for `useDefaultRequestParameterValues` custom config option. When enabled, query parameters and headers with IR-defined default values use Ruby's `params.fetch(:key, default)` idiom instead of conditional assignment, matching the behavior of other Fern generators.