Using the mackms package to load keys that do not have a tag attribute set

[jwright-stripe]

What would you like to be added?

Hey there!

I really like the mackms package- it makes working with the keychain from Go really pleasant. 🎉

One issue I'm running into is that the current URI structure sets a default tag attribute if one is not provided. This makes it not possible to work with existing keys that do not have a tag on them today.

It doesn't appear possible to explicitly tell mackms to not add a tag attribute to the SecItemCopyMatching queries.

Is this something that you'd be open to considering? I know that changing the existing default behavior wouldn't be backwards compatible. Just tossing out an option, maybe an approach for supporting null* style parameters in the URI, e.g. label=my-name;hash=ccb792f9d9a1262bfb814a339876f825bdba1261;nulltag=true might work for explicitly unsetting attributes.

Note that this might require adding more conditionals like this one so that tags are truly excluded from the search dictionary.

Why this is needed

This will make it easier to work with existing keychain items that may not have particular attributes like tags.

I'm happy to help with this if there's an approach you like, but either way I appreciate y'all considering this! Keep up the great work.