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b8900d0b80734c6cca25595e8613d47f1d48909f
before the Product<> type is constructed. This resets template depth on each intermediate evaluation, and gives simpler code. Introducing ei_eval_if_expensive<Derived, n> which evaluates Derived if it's worth it given that each of its coeffs will be accessed n times. Operator* uses this with adequate values of n to evaluate args exactly when needed.
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