* Validation is not documentation, either it's there or it's not there, with built-in keyword arguments it's there, with a hash-hack it probably isn't.
* Documenting a hash-hack will still require spelling out that one of the positional parameters is a hash, then diving into that hash to spell out the various keys. This adds one worthless level of indirections to first-class keyword parameters, which can just treat all parameters the same way for documentary purposes.
* Documenting a hash-hack will still require spelling out that one of the positional parameters is a hash, then diving into that hash to spell out the various keys. This adds one worthless level of indirections to first-class keyword parameters, which can just treat all parameters the same way for documentary purposes.