@Geobert I only now see this response, sorry about that.

A newtype is a wrapper type around one other type, for details have a look at this.

How that plays out in this context is that you write such a newtype N for e.g. Duration, and then implement Serialize and Deserialize for N rather than Duration (which is not possible as both it and Serde's traits are defined outside your own crate).

By manipulating exactly how the internal Duration is de/serialized (which is done by manually implementing Serialize and Deserialize) it's possible to get around the whole "I can't serialize this!" issue, at the cost of a fair amount of boilerplate.

That is also where my request to implement serialization directly for all chrono types comes from.

Add Serialize/Deserialize for Duration #117

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