---
title: "RFC 9110 Accept headers, dotenv fixes, and Ractor safety"
url: https://daily.dev/posts/rfc-9110-accept-headers-dotenv-fixes-and-ractor-safety-fcju6cnjp
source_url: https://world.hey.com/this.week.in.rails/rfc-9110-accept-headers-dotenv-fixes-and-ractor-safety-7838327c
type: article
source: "This Week in Rails"
published: 2026-06-28T06:32:20.522Z
updated: 2026-06-28T06:32:40.079Z
tags: ["general-programming", "rails"]
reading_time: 5
upvotes: 0
comments: 0
language: en
---

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# RFC 9110 Accept headers, dotenv fixes, and Ractor safety

**[This Week in Rails](https://daily.dev/sources/twirails)** · 5 min read · 0 upvotes · 0 comments

## Summary

This week in Rails covers a range of bug fixes and improvements. Key changes include an opt-in for RFC 9110 compliant Accept header content negotiation, dotenv fixes for inline comment stripping and path-based memoization, and several mutation-safety fixes across ActionDispatch, ActiveModel, and ActiveRecord. Association handling improvements cover polymorphic associations with custom primary keys, composite primary key inverse matching, and a new class attribute for primary_key. Ractor safety work continues with frozen defaults and copy-on-write patterns applied to TimeFormats, rescue handlers, parameter encodings, and more. The json gem was bumped to 2.20.0 with comment support enabled, and safe_join's default separator was cleaned up.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://world.hey.com/this.week.in.rails/rfc-9110-accept-headers-dotenv-fixes-and-ractor-safety-7838327c>

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---

Tags: [#general-programming](https://daily.dev/tags/general-programming), [#rails](https://daily.dev/tags/rails)

[View this post on daily.dev](https://daily.dev/posts/rfc-9110-accept-headers-dotenv-fixes-and-ractor-safety-fcju6cnjp)