Phase 4: Type expansion (Int / Long / Bool / Double / Date / String)

[TomiCheng]

Goal

Extend Put / Get beyond byte[] to the common scalar types so the client is useful for typical caching workloads. End of this phase: the same Put / Get path round-trips int, long, bool, double, DateTime, and string against a real Geode container.

Done when

• Each of the MVP DSFIDs encodes / decodes correctly:
  • String (DSFID 87)
  • Integer (i32)
  • Long (i64)
  • Boolean
  • Double
  • Date
  • byte[] (already covered by Phase 3)
  • null
• Integration test (Testcontainers) round-trips each type — Put then Get returns an equal value.
• Type mismatch on GetAsync<T> (server stored an int, caller asked for string) raises a typed exception, not a silent failure.

Tasks

• src/Geode.Client/Serialization/DSCode.cs — enum / constants for the MVP subset.
• src/Geode.Client/Serialization/ValueSerializer.cs — Encode<T> / Decode<T> switch on DSCode.
• src/Geode.Client/Serialization/StringSerializer.cs — UTF-8 with the modified-UTF-8 rules Geode actually uses (verify against cppcache/src/DataOutput.cpp::writeUTF).
• src/Geode.Client/Serialization/DateSerializer.cs — DateTime ↔ Java epoch milliseconds.
• tests/Geode.Client.Tests/Serialization/ValueSerializerTests.cs (byte fixtures per type).
• tests/Geode.Client.IntegrationTests/TypedPutGetTests.cs.

References

• cppcache/include/geode/internal/DSCode.hpp — DSFID values.
• cppcache/src/DataOutput.cpp / DataInput.cpp — primitive write/read.
• cppcache/src/CacheableString.cpp — string encoding rules (mind the modified-UTF-8 quirks for \0 and surrogate pairs).
• CLAUDE.md → "Serialisation (MVP)".

Out of scope

• PDX (Phase 11) — typed objects with arbitrary fields.
• Collections (List, HashMap) — Phase 11+.
• Custom user serialisers.

Branch

feat/phase-4-type-expansion