@claude /review Only report on issues of potential concern; we don't need commentary on anything that doesn't require further consideration.

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PR Review: #20897 - Expose selection custom field labels in the REST API

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Two issues of potential concern:

1. Breaking API change for existing integrations

SELECT and MULTISELECT custom fields previously returned raw strings (e.g. "bar" / ["bar", "baz"]). After this PR they return {"value": "bar", "label": "Bar"} / [{"value": "bar", "label": "Bar"}, ...]. Any existing API client reading these fields will break silently — it receives a dict/list-of-dicts where it expected a string, with no error and no version signal.

This is the same tradeoff made when similar changes were applied to built-in choice fields, so it may be intentional, but it should be called out explicitly in the PR as a breaking change.

2. Potential 500 error when a client writes back the read format for MULTISELECT

to_internal_value in customfields.py passes SELECT/MULTISELECT values through unchanged, so if a client naively echoes back what it read (a list of dicts) for a MULTISELECT write, that list reaches CustomField.validate() unmodified. The validation at customfields.py:825-826 then does:

if not set(value).issubset(self.choice_set.values):

set() cannot hash dicts, so this raises an unhandled TypeError rather than a ValidationError, which surfaces as a 500. Fix this →

The SELECT case produces a legible ValidationError("Invalid choice...") rather than a 500, so it is less urgent, but the MULTISELECT case should be addressed.

A minimal fix in to_internal_value would be to extract the raw value when a dict or list-of-dicts is submitted for these types, matching how OBJECT/MULTIOBJECT values are normalized on write.

pre classed review 1 is known it's a breaking change. 2 fixed - now consistent across the board: read returns {value, label}; write takes the raw value; the object form is rejected with a 400 for both selection types - same as built-in choice fields.