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Malte UblandClaude 5.5
460bd6fb38
A class whose methods are reachable through `X.prototype` widens its method signatures to checked values so a JS caller can hand anything across. The widening replaced every non-void return with DYN, which erased a GENERATOR method's generator type; the generator branch below then had no generator channels to build its metadata from and refused the whole class (SC2001 in `%init`, re-emitted as a runtime fence in a JS file). Every `assert.sameValue(c.m, C.prototype.m)` variant of the campaign therefore refused at runtime, 759 of them in the generator-method chapters alone. A generator's return kind is already a checked-crossable ABI: dynFrom boxes a generator by reference and dyn calls resume it through the dyn generator ops, so only the arguments need the widening. Guard the return widening to non-generator methods. Test262, 1,110 affected variants, before/after on the candidate (class/gen-method 52->76, class/async-gen-method 76->128, class/scope-gen-meth 0->8); no pass->fail and no typed-path delta. Co-Authored-By: Claude 5.5 <noreply@anthropic.com>