From the HackerLinks archive

Clojure 1.13 adds support for checked keys

Clojure 1.13 adds checked keys for clearer map contracts.

At a glance:

First seen:2026-07-06

Last seen:2026-07-06

Times seen:1

Website:clojure.org

The short version

Clojure 1.13 adds checked keys for clearer map contracts.

Why it caught our attention

The feature prompted practical discussion about safer data boundaries and ergonomics.

Where it surfaced on Hacker News

2026-07-06

Editorial paraphrase

Replies focused on required versus optional checked keys, runtime guarantees, and how they fit with spec’ed maps.

Clojure 1.13 adds support for checked keys