[keelerm84]

Config#private_attributes now returns a Set of attribute reference
strings instead of an Array. The :private_attributes option still
accepts any Enumerable, and the SDK converts it to a Set.

LDContext#private_attributes now returns a frozen Set of Reference
objects instead of an Array. The context already stored a Set
internally and copied it to an Array on every call. Private attributes
have no meaningful order or duplicates, so a Set is the correct type.

Code that indexes into the result or calls Array-only methods on it
must change. LDContext#to_h and #to_json still emit privateAttributes
as an Array, so serialized contexts and event payloads do not change.

---

Note

Overview
Breaking change: Config#private_attributes and LDContext#private_attributes now expose frozen Sets instead of arrays. The :private_attributes config option still accepts any Enumerable and is normalized (deduped) into a set; context _meta.privateAttributes may be an array or a set when building a context.

LDContext stops copying its internal set to an array on every read, and equality checks use set comparison directly. ContextFilter stores global private refs in a set and merges them with context refs via set union (|). Reference.create is idempotent when passed an existing Reference.

Serialized context output is unchanged: hash_single_kind still emits privateAttributes as an array via .to_a.

^{Reviewed by Cursor Bugbot for commit 4de0ad6. Bugbot is set up for automated code reviews on this repo. Configure here.}

[kinyoklion]

I think we need to freeze the private_attributes set on the config maybe.

[kinyoklion]

I do have some concerns that you cannot access this property and then feed it directly back into a context without causing a problem.

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

^{❌ Bugbot Autofix is OFF. To automatically fix reported issues with cloud agents, have a team admin enable autofix in the Cursor dashboard.}

^{Reviewed by Cursor Bugbot for commit 228d01e. Configure here.}