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5326: infer: Add type inference support for Union types r=flodiebold a=otavio This adds the type inference to Union types and add a small test case for it, ensuring it keeps working in future. Fixes: #5277 Signed-off-by: Otavio Salvador <otavio@ossystems.com.br> ---- # Co-authored-by: Otavio Salvador <otavio@ossystems.com.br>