I agree, if he's open to one he should like the other too. But I don't think they’re "part & parcel".
We already have user-defined objects in printf, by virtue of their string-ize overload. %s will basically tell any object to render itself in the default manner.
What I suppose he's talking about are formats like d for decimal and h for hex. Maybe define a way to specify rectangular or polar for complex numbers, for example.
—John
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