QA Report

[code423n4]

Missing space in the comment in:

Contract: ERC20PermitPermissionedMint.sol

line 01

Recommendation:

// SPDX-License-Identifier: Unlicense

It is best practice and also unnecessary to initialize variables in for loops as they get set to 0 by default in:

Contract: ERC20PermitPermissionedMint.sol

line 84

Recommendation:

for (uint i; i < minters_array.length; i++){

Contract: frxETHMinter.sol

line 129

Recommendation:

for (uint256 i; i < numDeposits; ++i) {

Contract: OperatorRegistry.sol

line 63
line 84
line 114

Recommendation:

for (uint256 i; i < arrayLength; ++i) {
for (uint256 i; i < times; ++i) {
for (uint256 i; i < original_validators.length; ++i) {

It is best practice to always start a new statement/sentence in capital letters, in comments.
This will also bring more consistency throughout all code under review.

Contract: xERC4626.sol

line 23
line 26
line 29
line 32
line 39
line 46
line 53
line 54
line 58
line 59

Recommendation:

/// @notice The maximum length of a rewards cycle
/// @notice The effective start of the current cycle
/// @notice The end of the current cycle. Will always be evenly divisible by `rewardsCycleLength`.
/// @notice The amount of rewards distributed in a the most recent cycle.
// Seed initial rewardsCycleEnd
// Cache global vars
// No rewards or rewards fully unlocked
// Entire reward amount is available
// Rewards not fully unlocked
// Add unlocked rewards to stored total

It is best practice and also unnecessary to initialize variables as they get set to 0 by default in:

Contract: frxETHMinter.sol

line 94

Recommendation:

uint256 withheld_amt;	

It is best practice to use the safe library from OpenZeppelin to, in this case, make external approvals and transactions in:

Contract: frxETHMinter.sol

line 75
line 200

Recommendation:

frxETHToken.safeApprove(address(sfrxETHToken), msg.value);
require(IERC20(tokenAddress).safeTransfer(owner, tokenAmount), "recoverERC20: Transfer failed");	

Grammer issues in comments in:

Contract: sfrxETH.sol

line 32

"drops" should be "drop"

line 33

"is" should be "are"

line 47

"Noop" should be "No"

line 53

the "." after worth should be "?"

Contract: frxETHMinter.sol

line 35

"adds" should be "add"

line 84

and "sender's" should ultimately be changed to "senders"

line 108

and "sender's" should ultimately be changed to "senders"

line 138

the "into" should be removed completely

line 176

"submites" should be "submits"

Contract: xERC4626.sol

line 13

"autocompound" should be two words "auto compound"

line 16

there is no need for the "," after "creation"

line 18

"which" should be "that"

line 32

"amount" should be "number

there is no need for the "a" in front of the "the"

line 43

"amount" should be "number"

"share holders" should be one-word "shareholders"