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isinstance(amount, (int, float)) is not a number check: NaN walks through a withdrawal guard
A dev.to walkthrough sends {"amount": NaN} to an ordinary Flask endpoint and drains it. Python's json parser accepts the constant, and three plausible guards all let it through.
Publishers:dev.to
Reality
- Evidence72
- Adoption
- Insufficient
- Hype gap+10
- Incentives22
- Confidence68