FA-62907 / Insurance premium rating / Member archive

Deductible credit interpolation: Zero deductible is rejected as invalid · case 02

A full-coverage zero-deductible quote returns invalid.

Member previewVariant 2 · 3 implementations · 10 checks per implementation

Case contract

Input premium, deductible and table [[deductible, credit per mille]] ascending (credits may be negative surcharges). Deductibles at or below the first row take its credit, at or above the last row take the last credit (no extrapolation), otherwise interpolate linearly. Credit cents = floor(prem*c/1000+1/2). Negative deductible or empty table -> 'invalid'. Return [credit, premium-credit].

Why this case matters

Premium rating engines apply ordered tabular rules where one misplaced boundary or step silently misprices policies.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
zero deductible uses lowest row	`"invalid"`	`[-870, 174970]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

Member access is invitation-based. Sign in with your invited account to inspect the sources.