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Malte UblandClaude Opus 5.5
58d3981476
A computed TypeScript field without an initializer (`[INTERNALS]: T`) was refused even with a stable Symbol()/Symbol.for() or literal key, which contradicts the documented rule that TypeScript fields need an initializer or an unconditional constructor assignment. Such a field now takes its declared type and the identifier fields' definite-assignment rule: an unconditional top-level `this[key] = ...` in the constructor, otherwise the checked deferred-initialization slot. Types that admit undefined (optional fields) start undefined. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>