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11 changes: 11 additions & 0 deletions fern/products/sdks/overview/ruby/changelog/2026-01-28.mdx
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## 1.0.0-rc83
**`(fix):`** Fix request body serialization bug where path/query/header parameters were incorrectly
serialized as nil values in the request body. For endpoints with inlined request bodies
that also have path, query, or header parameters, the wrapper type (which includes all
endpoint parameters) was being created with only body properties, causing non-body fields
to be nil and serialized as null in the JSON body. The fix uses a serialize-then-split
pattern: serialize ALL params through the wrapper type first, then remove non-body params
from the serialized result. This ensures proper type conversion while keeping non-body
params out of the request body.