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self.mask = metas["mask"]
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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.