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See below; version 2.4.2 from the ubuntugis ppa.

Expected output is just the version information, no crash.

$ gdal2tiles.py --version
GDAL 2.4.2, released 2019/06/28
Traceback (most recent call last):
  File "/usr/bin/gdal2tiles.py", line 2927, in <module>
    main()
  File "/usr/bin/gdal2tiles.py", line 2917, in main
    input_file, output_folder, options = process_args(argv[1:])

rasterio.warp.reproject takes a kwargs parameter, which is passed to the "transformation function". It is not by any means clear what this means. What transformation function? What are the allowed values for kwargs? Can this please be expanded on? Thanks.

GRASS GIS should support, i.e., understand the environmental variable BROWSER. Many other tools use it to set web browser and GRASS GIS should too. These include webbrowser package from Python standard library, Google Earth, or man:

              ...The choice of browser is determined by the optional
              browser argument i

In some ways fasterize does diverge from rasterize (e.g., #13). These should be tersely described in the README/vignette and function documentation.