I have tested this item ✅ successfully on 8ae628e

Tested by review:

• Reviewed that test cases and test data make sense.
• Checked in logs of unit tests CI action that more tests and assertions have run for this PR compared to the current 5.4-dev branch, and that no new PHP deprecation messages were created by the new test cases.

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I have tested this item ✅ successfully on 6a1e2c0

Tests look correct based on the regex. Quick question: Should we add a test case for whitespace (e.g., ' true ')? I assume the BooleanRule is intended to be strict and reject untrimmed values, so adding that as a negative test case explicitly would confirm that behavior.

I have tested this item ✅ successfully on 6a1e2c0

Tests look correct based on the regex. Quick question: Should we add a test case for whitespace (e.g., ' true ')? I assume the BooleanRule is intended to be strict and reject untrimmed values, so adding that as a negative test case explicitly would confirm that behavior.

I have tested this item ✅ successfully on 6a1e2c0

Tests look correct based on the regex. Quick question: Should we add a test case for whitespace (e.g., ' true ')? I assume the BooleanRule is intended to be strict and reject untrimmed values, so adding that as a negative test case explicitly would confirm that behavior.

I have tested this item ✅ successfully on 6a1e2c0

Tests look correct based on the regex. Quick question: Should we add a test case for whitespace (e.g., ' true ')? I assume the BooleanRule is intended to be strict and reject untrimmed values, so adding that as a negative test case explicitly would confirm that behavior.

RTC