What can be better?

In the documentation for the density function, the required arguments are listed as pressure, temperature, and mixing_ratio. However, in the note, the equation is written in terms of virtual temperature, which is inconsistent and maybe confusing. Perhaps the temperature argument could be defined as "Air temperature, or the virtual temperature if mixing_ratio is set to zero" to make things clearer. Or, mixing_ratio could be an optional argument I suppose (if missing, it's zero).

In my case, I already have virtual temperatures in my data, and do not have mixing ratio, so at first glance it seemed I might need to roll my own computation. (Admittedly, it's not the most complicated calculation to begin with!)