Compute Fund Expense Ratios

Computes a fund's gross and net expense ratios and Total Expense Ratio (TER) from SUPPLIED gross expense components (flat amounts or accruals, using the identical accrual conventions as recompute_fund_nav/FN-1) and average net assets, applying any declared fee waivers/caps strictly in a DECLARED order using fixed-point BigInt money math throughout (no float accumulation). Waiver ordering is the substance: the order in which fixed-dollar caps, percent-of-remaining reimbursements, and rate caps apply changes the net expense ratio, so the order is a required declared input, never a house convention, and every waiver's running-balance effect is returned for audit. HARD FENCE: every expense component, average-net-assets figure, and waiver term is supplied and asserted, never fetched (zero-egress); this recomputes the arithmetic over declared inputs and attests THAT, never an opinion on expense accuracy and never a compliance determination. Third entry of the Funds/NAV family (nav-verification-pack) alongside recompute_fund_nav (FN-1) and test_nav_error_materiality (FN-2). 40-Act/UCITS citations informative only.

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