image_optim
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Add support for jpegli
jpegli is an improved JPEG encoder/decoder that backports applicable new techniques of JPEG XL to JPEG. This encoder can reduce the size of jpeg's optimized with image_optim at quality 100 level settings, though it requires decoding and then re-encoding with djpegli and cjpegli respectively to produce the result.
Turns out can't re-encode while being truly lossless: https://github.com/google/jpegli/issues/10#issuecomment-2221735156
worker can be marked lossy, but does it improve over using jpegrecompress?