Money comparison in JavaScript spec
You're asking an AI agent to write a JavaScript function that decides whether a user's wallet balance is 'enough' to cover a purchase and computes the remaining balance, for an e-commerce checkout. Write the spec that makes the comparison and subtraction monetarily correct in JS specifically. What numeric representation and comparison rules do you mandate, and what acceptance criteria prove it? Then describe what a naive prompt ('check if balance >= price and subtract') produces that lets the wrong transactions through.
remaining_cents_after_purchase(credit_amounts: list[str], price: str) → int[["0.10","0.20"],"0.30"]out0[["0.10","0.20"],"0.31"]out-1[["19.99","0.01"],"10.00"]out1000Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it (tests, edge cases, reading critically), and how you’d re-prompt or decompose to get it right.
Vibe & agentic: describe the solution in plain language (or narrate it) and the coach grades your approach.