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    The function selector is always 4 bytes, so that's in its own "slot" Commented Sep 20, 2018 at 10:33
  • This question demonstrates the padding in calldata, as @Mikhail answers. The actual call doesn't make usual sense because enter is a function that only has one parameter, so naively h typically won't be used. Commented Nov 14, 2019 at 8:48
  • How to find out the maximum size of the calldata? Commented Mar 16, 2021 at 10:05