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> just fuking use a poly fill to add support of JPEG XL. Or store JPEG XL and convert on the fly to JPEG to supply it to browsers that don't support JPEG XL.

Doesn't a polyfill imply more Javascript running on the device?

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Only until the browser gets updated and then the polyfill stops being invoked automatically. It's self-healing.

Tt's a WASM . And really isn't very big. So if you need to store and serve many images files, potentially big images like in an preservation & diffusion software (like the stuff that I'm working), I felt that I could afford to pay the extra few KiBs on that WASM.

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