[release/6.0] Fix byte array handling in STJ sourcegen #60004
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Tagging subscribers to this area: @dotnet/area-system-text-json Issue DetailsBackport of #59957 to release/6.0 /cc @eiriktsarpalis Customer ImpactTestingRisk
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Backport of #59957 to release/6.0
/cc @eiriktsarpalis
Customer Impact
Fixes a bug where STJ sourcegen would incorrectly serialize
byte[]instances as JSON arrays of numbers. This diverges from the default behavior of the reflection-based serializer which representsbyte[]as Base64 encoded strings. It is currently not possible to roundtrip data written with the v5 reflection serializer. This is a customer reported issue.Testing
Added tests validating the correct behavior.
Risk
Low. Makes minor interventions in product code that specifically addresses byte array Roslyn type symbol resolution.