gamer147 9e8ebd1b2b fix(battle-node): preserve long type on numeric array elements in FromJson ...

Root cause for the lingering mulligan failure: the inline conditional
expression in MsgEnvelope.ToObject

    JsonValueKind.Number => el.TryGetInt64(out var l) ? l : el.GetDouble(),

unified its branches to the common implicit-convertible type. long→double
is implicit, so both branches collapsed to double and the integer value
silently widened. Inside an array (idxList:[2]), each element came back
as boxed double; OfType<long> in ExtractIdxList then filtered every
entry out, so swapIndices arrived empty and BuildSwapResponse echoed
the unchanged hand — exactly the diff-against-Deal mismatch the client
flagged as "Card swap failed: AbandonCards[2]/DrawCards[]".

Extract a ParseNumber helper that returns object explicitly so each
branch boxes its own runtime type. Also harden ExtractIdxList to accept
any boxed numeric type (long/int/double/decimal/string) so a future
JSON-parser drift can't silently regress this path again.

Two regression tests:
- FromJson_NumericArray_PreservesLongTypeOnEachElement: confirms the
  fix at the JSON-parse layer with a hardcoded "{\"idxList\":[2,3]}".
- Swap_WithIdxListContainingTwo_ProducesHandWithFreshIdxAtPosition1:
  exercises the dispatch end-to-end with a Body holding a real boxed
  long; asserts position 1 of the response hand is the fresh deck idx 4.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

2026-06-01 08:40:50 -04:00

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