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Let's say internally you store `var` as a `uint64`, in a public function with a `var` param do you type it as a `uint64` or type it as a `uint256` and `safeCast` it?

Feels like using a `uint256` in the public api is cleaner from a consumer perspective? But obviously at a cost.

Is there a cost? Function arguments are not packed in Solidity, so the param is consuming a u256 anyway, I believe.

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Is there a cost? Function arguments are not packed in Solidity, so the param is consuming a u256 anyway, I believe. 

https://ethereum.stackexchange.com/questions/40555/does-the-order-of-function-parameters-matter-in-regards-to-variable-types

`SafeCast` will add some gas at a minimum to run the check, but fairly minimal. Not very clean from an aesthetic standpoint either.