Rounding errors in shares
Description:
Small deposits near minDepositAmount (1000 USDC) may result in zero shares due to truncation in division (shares = amount * totalShares / totalAmount).
Impact:
Depositors lose funds if shares round to zero.
Violates Depositor Share Value Preservation.
Affected Code:
PerpetualVault.sol#_mint()calculates shares with integer division.
Recommendation:
Enforce a minimum share precision (e.g., 1e6) or use a shares model with higher decimals.
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