gas optimization: leave one wei feature

[alex0207s]

For gas optimization purposes, we retain 1 wei of each token in our contract(GS and SOS). This will impact the initial swap of every token, as 1 wei will be left in our contract.

• Implement the logic for leaving 1 wei in GenericSwap.sol
• Implement the logic for leaving 1 wei in SmartOrderStrategy.sol

[github-actions[bot]]

Changes to gas cost

Generated at commit: e014f31eceea2818d2f0861b8e0b8f1ea2f92697, compared to commit: 30182962c00a4fff72b4b11b72989fd64b00d46e

🧾 Summary (20% most significant diffs)

Contract	Method	Avg (+/-)	%
GenericSwap	executeSwap executeSwapWithSig	+27,482 ❌ +26,454 ❌	+53.77% +22.97%
LimitOrderSwap	fillLimitOrderFullOrKill fillLimitOrderGroup	+17,847 ❌ +44,010 ❌	+19.91% +22.80%

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Full diff report 👇

| Contract | Deployment Cost (+/-) | Method | Min (+/-) | % | Avg (+/-) | % | Median (+/-) | % | Max (+/-) | % | # Calls (+/-) | |:-|-:|:-|-:|-:|-:|-:|-:|-:|-:|-:|-:| | **GenericSwap** | 1,648,811 (0) | _executeSwap_
_executeSwapWithSig_ | 678 (0)
4,021 (0) | **0.00%**
**0.00%** | 78,593 (+27,482)
141,621 (+26,454) | **+53.77%**
**+22.97%** | 69,421 (+46,410)
146,087 (+25,904) | **+201.69%**
**+21.55%** | 229,258 (+45,802)
270,290 (+54,008) | **+24.97%**
**+24.97%** | 12 (+2)
4 (0) | | **LimitOrderSwap** | 2,513,778 (0) | _cancelOrder_
_fillLimitOrder_
_fillLimitOrderFullOrKill_
_fillLimitOrderGroup_ | 5,557 (0)
5,990 (0)
18,100 (0)
194,749 (+38,949) | **0.00%**
**0.00%**
**0.00%**
**+25.00%** | 17,027 (+1,200)
388,582,324,370,404,700 (+15,232)
107,463 (+17,847)
237,063 (+44,010) | **+7.58%**
**+0.00%**
**+19.91%**
**+22.80%** | 6,156 (0)
139,615 (+20,869)
127,205 (+22,700)
237,546 (+42,600) | **0.00%**
**+17.57%**
**+21.72%**
**+21.85%** | 31,861 (+2,800)
8,937,393,460,516,606,000 (+19,456)
191,206 (+22,700)
291,787 (+58,357) | **+9.63%**
**+0.00%**
**+13.47%**
**+25.00%** | 7 (0)
23 (0)
7 (0)
6 (0) | | **SmartOrderStrategy** | 1,178,556 (+5,606) | _approveTokens_
_executeStrategy_ | 34,188 (0)
709 (0) | **0.00%**
**0.00%** | 152,602 (-4,737)
101,399 (+16,680) | **-3.01%**
**+19.69%** | 233,101 (0)
111,081 (+22,272) | **0.00%**
**+25.08%** | 257,601 (0)
575,041 (+79,635) | **0.00%**
**+16.07%** | 26 (+1)
19 (+2) | | **CoordinatedTaker** | 2,201,199 (0) | _submitLimitOrderFill_ | 1,328 (0) | **0.00%** | 108,596 (+15,414) | **+16.54%** | 38,252 (0) | **0.00%** | 267,599 (+42,600) | **+18.93%** | 7 (0) | | **UniAgent** | 1,412,993 (0) | _approveAndSwap_
_swap_ | 9,219 (0)
88,963 (0) | **0.00%**
**0.00%** | 118,097 (+15,134)
169,992 (+18,217) | **+14.70%**
**+12.00%** | 150,455 (+22,700)
172,168 (+23,403) | **+17.77%**
**+15.73%** | 194,617 (+22,700)
231,568 (+19,900) | **+13.20%**
**+9.40%** | 3 (0)
12 (0) | | **RFQ** | 2,287,309 (0) | _fillRFQ_
_fillRFQWithSig_ | 2,134 (0)
2,741 (0) | **0.00%**
**0.00%** | 107,125 (+12,102)
83,240 (+6,633) | **+12.74%**
**+8.66%** | 125,216 (+18,611)
46,495 (0) | **+17.46%**
**0.00%** | 212,334 (+21,314)
200,485 (+19,900) | **+11.16%**
**+11.02%** | 23 (0)
3 (0) | | **AllowanceTarget** | 570,375 (0) | _spendFromUserTo_ | 11,608 (0) | **0.00%** | 25,810 (+2,595) | **+11.18%** | 26,889 (0) | **0.00%** | 38,934 (+7,786) | **+25.00%** | 3 (0) |