Fix TypeError in pattern property validation with integer keys

[Copilot]

Problem

PHP 8+ with strict_types throws TypeError: preg_match(): Argument #2 ($subject) must be of type string, int given when validating schemas with patternProperties against data decoded with json_decode($json, true). Numeric keys (e.g., HTTP status codes 200, 404 in OpenAPI specs) become integers in associative arrays.

Changes

ObjectConstraint.php

• Cast array keys to string before preg_match() in validatePatternProperties()

// Before
if (preg_match($fullRegex, $i)) {

// After  
if (preg_match($fullRegex, (string) $i)) {

PatternPropertiesTest.php

• Added test case validating OpenAPI-like responses with numeric status codes using associative arrays

Impact

Resolves validation failures for any schema using patternProperties when data contains numeric keys. No behavior change for existing string keys.

Warning

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>TypeError: preg_match(): Argument #2 ($subject) must be of type string, int given</issue_title>
<issue_description>Seen in https://integration.wikimedia.org/ci/job/quibble-for-mediawiki-core-vendor-mysql-php83/4498/consoleFull trying to upgrade to 6.x (note link won't work forever)

04:02:00 1) MediaWiki\Tests\Rest\Handler\ModuleSpecHandlerTest::testGetInfoSpecSuccess with data set "module and version" ('/workspace/src/tests/phpunit/...e.json', array(array('mock', 'v1')), array(array('mock/v1 <message key="rest-mo...ssage>', '1.3-test', array('test@example.com')), array(array('https://example.com:1234/api/mock/v1')), array(array(array(array(array('q', 'query')), array(array('OK'))), array(array(true, array(array(array('object', array('b'), array(array('string')))))), array(array('OK'))))), array(array(array('boolean')), array(PHPUnit\Framework\Constraint\IsAnything Object (...)))))
04:02:00 TypeError: preg_match(): Argument jsonrainbow/json-schema#2 ($subject) must be of type string, int given
04:02:00 
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/ObjectConstraint.php:64
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/ObjectConstraint.php:40
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Constraint.php:84
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:66
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:43
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Constraint.php:116
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/ObjectConstraint.php:139
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/ObjectConstraint.php:45
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Constraint.php:84
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:66
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:43
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Constraint.php:116
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/ObjectConstraint.php:66
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/ObjectConstraint.php:40
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Constraint.php:84
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:66
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:43
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Constraint.php:116
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/ObjectConstraint.php:66
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/ObjectConstraint.php:40
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Constraint.php:84
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:66
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:43
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Constraint.php:116
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/ObjectConstraint.php:139
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/ObjectConstraint.php:45
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Constraint.php:84
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:66
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/UndefinedConstraint.php:43
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/Constraint.php:116
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Constraints/SchemaConstraint.php:96
04:02:00 /workspace/src/vendor/justinrainbow/json-schema/src/JsonSchema/Validator.php:92
04:02:00 /workspace/src/tests/phpunit/JsonSchemaAssertionTrait.php:70
04:02:00 /workspace/src/tests/phpunit/integration/includes/Rest/Handler/ModuleSpecHandlerTest.php:85
04:02:00 /workspace/src/tests/phpunit/integration/includes/Rest/Handler/ModuleSpecHandlerTest.php:223
Logs generated by test
04:02:00 
04:02:00 2) MediaWiki\Tests\Rest\Handler\ModuleSpecHandlerTest::testGetInfoSpecSuccess with data set "prefix-less module" ('/workspace/src/tests/phpunit/...s.json', arra...

</details>



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- Fixes jsonrainbow/json-schema#870

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