Flooring seconds in compoundInterest

[holyfuchs]

compoundInterest is calculating the interest rate based on floored seconds:

FlowCreditMarket/cadence/lib/FlowCreditMarketMath.cdc

Lines 21 to 39 in 786cfa9

	/// Fast exponentiation for UFix128 with a non-negative integer exponent (seconds).
	/// Uses exponentiation-by-squaring with truncation at each multiply (fixed-point semantics)
	access(all) view fun powUFix128(_ base: UFix128, _ expSeconds: UFix64): UFix128 {
	if expSeconds == 0.0 { return 1.0 }
	if base == 1.0 { return 1.0 }
	var result: UFix128 = 1.0
	var b = base
	var e = expSeconds
	// Floor the seconds to an integer count
	var remaining = UInt64(e)
	while remaining > 0 {
	if remaining % 2 == 1 {
	result = result * b
	}
	b = b * b
	remaining = remaining / 2
	}
	return result
	}

FlowCreditMarket/cadence/contracts/FlowCreditMarket.cdc

Lines 4557 to 4565 in 786cfa9

	access(all) view fun compoundInterestIndex(
	oldIndex: UFix128,
	perSecondRate: UFix128,
	elapsedSeconds: UFix64
	): UFix128 {
	// Exponentiation by squaring on UFix128 for performance and precision
	let pow = FlowCreditMarketMath.powUFix128(perSecondRate, elapsedSeconds)
	return oldIndex * pow
	}

timestamp: UFix64
If getCurrentBlock().timestamp has a resolution below 1 second (utilizing the UFix), interacting with the contract every block will result in no interest accruing.