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fix(jsonschema): keep null on nullable collections - #8845
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soyuka merged 2 commits intoNov 13, 2026
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A nullable collection of objects (
?arraywithlist<Dto>|null) produced{"type":"array","items":{"$ref":...}}: the collection branches ofSchemaFactory::buildPropertySchema()wrote the schema and emptied$refs,so the nullable branch never ran. Validating against that schema rejects
null, e.g. MCP tool arguments: "Expectedarray, but receivednull".The type now becomes
["array","null"]; the OpenAPI 3.0 normalizer alreadymaps it to
nullable: true.