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Comments in docs and code for Image.thumbnail(), dating back to PIL 1.1.3 from March 14, 2002:
It is now the future.
The resample parameter was added in PIL 1.1.2 (May 2001) and defaulted to ANTIALIAS. In 1.1.3 (March 2002) it was changed to NEAREST with the FIXME note.
No reason is given in the PIL 1.1.3 release notes, but it looks like there were initially some problems with ANTIALIAS so they went with the safer option:
PR also contains some pep8 and pyflakes cleanup.
TODO: