Fix Enumerator::Lazy value packing of source yields#9466
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Lazy.make_proc was an arity-faithful passthrough (`yield yielder, *x`) instead of applying CRuby's rb_enum_values_pack rule (enum.c): 0 args -> nil, 1 arg -> the value, N args -> Array. Pipeline stages downstream expect the packed form, so a zero-argument source yield surfaced as `[]` and a multi-argument yield surfaced as separate block args, both diverging from MRI. Specced via Enumerable#take / Enumerator::Lazy#take shared examples in ruby/spec.
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This needs a bigger Java-based refactor with something like LazyYielder. Will turn the PR into a draft for now. |
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Lazy.make_proc was an arity-faithful passthrough (
yield yielder, *x) instead of applying CRuby's rb_enum_values_pack rule (enum.c): 0 args -> nil, 1 arg -> the value, N args -> Array. Pipeline stages downstream expect the packed form, so a zero-argument source yield surfaced as[]and a multi-argument yield surfaced as separate block args, both diverging from MRI.Specced via Enumerable#take / Enumerator::Lazy#take shared examples in ruby/spec#1363.