FA-61573 / Options payoff and settlement / Member archive

Special opening settlement value for index options: a component that did not open contributes zero · case 03

Settlement values drop sharply when any component is halted at the open.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Inputs components [weight, opening price or None, last close] and a divisor. Each component uses its opening price, or its last close if it did not open. Settlement = sum(weight*price)/divisor computed in Decimal and rounded half-up to cents. Return as a string.

Why this case matters

Option expiry, exercise and settlement engines move cash and shares; a wrong branch misstates obligations.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression missing open fallback 1	`"10.81"`	`"103.73"`	Failed

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