FA-86130 / Game economy crafting balance / Member archive

Magic find loot roll: Boundary roll selects the previous item · case 05

A roll exactly at an item boundary drops the earlier item.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

table = [[item, rarity, weight], ...]. Non-common weights become floor(w*(100+mf)/100) (mf may be negative). With total boosted weight T (None if 0), target = floor(roll*T/10000) for roll 0..9999; return the first item whose cumulative boosted weight exceeds target.

Why this case matters

Game economies leak or destroy currency when one crafting or pricing rule is off by one boundary, rounding stage or state update; the defect is observable in exact integer outcomes.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
zero weight entry skipped #1	`"a"`	`"c"`	Failed

MEMBER ARCHIVE

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