Behind the scenes, Serde doesn't actually generate a Serialize trait implementation for DurationDef or Duration. Instead, it generates a serialize method for DurationDef that has a similar signature as the Serialize trait's method. However, the method is designed to accept the remote Duration type as the value to be serialized. When we then use Serde's with attribute, the generated code simply calls DurationDef::serialize.
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Due to this more measured approach, error-diffusion dithering is even better at preserving details and can produce a more organic looking final image. However, the algorithm itself is inherently serial and not easily parallelised. Additionally, the propagation of error can cause small discrepancies in one part of the image to cascade into other distant areas. This is very obvious during animation, where pixels will appear to jitter between frames. It also makes files harder to compress.
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