⚡ ERC1155: Optimize Loops

[z0r0z]

Description

Not totally sure why but this seems to save some gas in loops (!=).

Checklist

Ensure you completed all of the steps below before submitting your pull request:

• Ran forge snapshot?
• Ran npm run lint?
• Ran forge test?

Pull requests with an incomplete checklist will be thrown out.

[sambacha]

         unchecked {
-            for (uint256 i = 0; i < owners.length; ++i) {
+            uint256 len = owners.length;
+            for (uint256 i = 0; i < len; ++i) {
                 balances[i] = balanceOf[owners[i]][ids[i]];
             }
         }

[sambacha]

         // Storing these outside the loop saves ~15 gas per iteration.
         uint256 id;
         uint256 amount;
+        uint256 len = ids.length;
 
-        for (uint256 i = 0; i < ids.length; ) {
+        for (uint256 i = 0; i < len; ) {
             id = ids[i];
             amount = amounts[i];