tiff_set example

[michalfratczak]

Could you please provide tiff_set function example?
I did several tries and looked into src code, but nothing seems to work for me.
For starters I tried to save F_Num exif data like so (my input tiff has no exif at all):

tifftools.tiff_set( source=tiff, output=tiff_new, overwrite=True, setlist=[ ( "33437:RATIONAL", '56 10') ] )