Three structural fixes to flatten mode, found bringing up games on-device
(Epic A1 Phase 5):
1. Nested classes: processFlatten now recurses through getDeclaredClasses()
(not gated on the outer class's eligibility), so nested Streamables like
BangConfig.Round get deterministic methods too. All detection/substitution/
insertion is scoped to each class's own body region (brace-matched,
comment/string-aware, member-class bodies masked during detection) so an
instrumented outer class can't hide — or poison — a nested one.
2. Ancestor-aware generation: a class whose ancestor declares read/writeObject
now generates `super.readObject(ins)` + only the fields declared below that
ancestor, instead of a self-contained full-set method. A self-contained
subclass method silently dropped the ancestor's side effects for every
subclass that previously inherited it: Prop.init() (server NPE cloning
board props at startRound), Item's _nondb identity extras (itemId=0 on
every wire-streamed item), InvocationMarshaller's _invdir rebind. Byte
layout is unchanged: the ancestor's method streams exactly the flattened
prefix. When the subclass adds no fields, nothing is generated — plain
inheritance is already complete (the field-free marshaller/unit case).
3. Abstract classes: substitution-only. Their default*Object() pass-throughs
are replaced in place with the class's own flattened prefix (making them
safe super-call targets — the reflective pass-through reads the full
dynamic-class set and would double-read the subclass tail), but whole
methods are never generated for them. Requires every Streamable ancestor
to be covered by the task's filesets; see findStreamMethodAncestor doc.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HhfHCXYp2ctWi76Z91y9Ut
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