warncreateglobal makes znap function unusable

[punk-dev-robot]

Hi, thank you for this amazing package manager. I recently found it and it's exactly the right amount of abstraction for me. It's truly fantastic, my prompt loads almost instantly and there is no black box magic.

I have an issue though with some plugins and znap function.

Some popular scripts, like fzf-tab or scm_breeze cause a lot of warning being printed to the console when using znap command, e.g znap status.

Commenting out NO_unset warncreateglobal in scripts/opts.zsh solves the issue.

I wander if it could be disabled or maybe configured with an option or environment variable.