Usage of Underscores

[jackturnbull]

Howdy Maple! Admittedly, more of a question than an issue here. Also far more granular than is reasonable, admittedly.

Using ERC20.sol as a base for some extensions and looking to keep a consistent variable convention & style for these. So far I've taken a trailing underscore to mean "local variable" and lack of underscore to be "global variable", but digest and recoveredAddress within the unchecked block of function permit is defined without the underscore.

Is that expected? Or do you have any further docs on the underscore style used at Maple?