fix: error mapping for fee_provision in excess_balance hint #2236
+4
−2
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The fee_provision computation incorrectly mapped both a missing fee entry and a Decimal.checked_mul failure to ExcessBalanceKeyError("fees"). This conflated a data lookup issue with a calculation overflow/invalid-state issue. Updated logic to:
This aligns error semantics with the rest of the function, which consistently distinguishes key-missing vs calculation failures.