STJ converter review round: streamed write, declared-type writer, modernization - #212

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manuc66 wants to merge 5 commits into

feature/split/pr5-plugin-patternfrom

feature/split/pr6-stj-review-round

Commits on Aug 15, 2026

Clarify two STJ behaviors in the README
manuc66
committed
3ca0375
Validate RegisterDynamicSubtype, cache the mapping key type, drop per-level LINQ
manuc66
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c03911c
Stream the discriminator write with Utf8JsonReader instead of JsonDocument
manuc66
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c051f3f
Use the declared property type in the base writer and reject mixed discriminator types
manuc66
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5e45a5b
Modernize JsonSubtypes.cs: private field, pattern matching, nullable fixes
manuc66
committed
960585f