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Thumbor failing on some SVGs with "ValueError: invalid literal for int() with base 10"
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Exception thrown by

self.internal_size = map(int, self.exif['ImageSize'].split('x')) in

Example affected file:

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Turns out that this file starts with some invisible characters before the <?xml, which makes it fall back to the default attempt of rendering through the imagemagick engine - not knowing what kind of file we're dealing with - and that in turns fails in this particular way (but would fail later by being unable to convert the image anyway).

The invisible characters are simply UTF-8 encoded BOM. Which means that this might be a valid file still and that's the issue to solve. It's probably a good idea to skip the BOM in general, for all file types.

Change 409314 had a related patch set uploaded (by Gilles; owner: Gilles):
[operations/debs/python-thumbor-wikimedia@master] Upgrade to 1.12

Change 409314 merged by Filippo Giunchedi:
[operations/debs/python-thumbor-wikimedia@master] Upgrade to 1.12