Fix lazy-collections doubleFibonaccis#241

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camillobruni wants to merge 2 commits intoWebKit:mainfrom

camillobruni:2025-12-09_lazy_collections

Commits on Dec 9, 2025

fix fib
camillobruni
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Commits on Dec 10, 2025

add intermediate checkLength steps for easier debugging
camillobruni
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