Clarification about leap days in monthly data

[lukruh]

Hello,
I assume, that the spei() function does not account for leap days in monthly input data (even when a time series is given), does it?
Looking at the code I'd think the data is given as it is to the fitting function without applying days_in_month or something like that.
However, I'm not an R expert and couldn't find anything related to leap days in the docs, so I'd like to have this clarified. As far as I understand providing actual measurements or any leap day aware data could impact the PDF fitting for February.

hargreaves() seems to account for leap days when time series objects are provided, but not for regular arrays.

Thanks for any help in advance.