<@U0YT5N3SL> `var3` is basically a bitset, each bi...

# announcements

[karelpeeters]

@fcoo var3 is basically a bitset, each bit indicates whether a certain parameter still requires a default value. If that's the case ie. if (var3 & 2**n != 0) the default value is created and used for the "actual" copy call.

var4 is reserved for future use, see https://stackoverflow.com/questions/39733830/default-arguments-vs-overloads-when-to-use-which/39748921#39748921