Gas Golf Comparator

Estimates several call variants against the same contract and ranks them, taking the median of multiple rounds rather than a single reading because estimates move with state. It then splits the difference into calldata cost and execution cost, which matters because calldata is charged before the contract runs at all — four gas per zero byte and sixteen per non-zero under EIP-2028 — so when the gap lives there, no amount of optimising inside the function will close it. Variants whose estimates wobble between rounds are flagged, so a small apparent saving is not mistaken for a real one. Nothing is ever sent.