FA-86204 / Game economy crafting balance / Member archive

Gem combining cascade: An exact triple does not combine · case 04

Exactly three gems stay uncombined.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

gems[t] = count of tier t gems for t = 0..max_tier. Tiers are processed upward: three tier t gems make one tier t+1 gem at a cost of (t+1)*10 gold each, limited by the remaining gold budget; newly made gems can cascade into the next tier. Max-tier gems never combine. Returns [counts, gold_spent].

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
two level cascade #1	`[[0, 3, 0], 30]`	`[[0, 0, 1], 50]`	Failed

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

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