Deserializes a vector element from a data source We use a concrete type 'Chars' for the data source here and can't use generic types using the AnimationDataSource trait: this is because Rust's lifetime checker seems to have a bug and borrows the `data` element for as long as the trait exists if we use the generic form due to some kind of interaction with the box_fn function (data is only required
(element_id: ElementId, data: &mut Chars)
source not stored for this graph (policy: none)
nothing calls this directly
no test coverage detected