Fee reversal balance mismatch
Review this Python that verifies a posted-then-reversed fee leaves a large account balance unchanged, as an end-of-day integrity check.
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1def apply_fee(balance, fee):
2 return balance + fee
3
4def reverse_fee(balance, fee):
5 return balance - fee
6
7def net_zero(balance, fee):
8 # balance like 1e16, fee like 0.07
9 after = apply_fee(balance, fee)
10 restored = reverse_fee(after, fee)
11 return restored == balance
12
13# net_zero(1e16, 0.07) -> expected True
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