Hide Node::data field and export Node::get{,_mut}()
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Currently `Node::data` field is public, but it is very strong restriction for internal representation of the node. Instead, it may be better to export `Node::get() -> &T` and `Node::get_mut() -> &mut T`, and hide `Node::data` field. See [Future proofing - Rust API Guidelines](https://rust-lang-nursery.github.io/api-guidelines/future-proofing.html#structs-have-private-fields-c-struct-private).
`Arena::new_node()` does not need to know `Node`'s internals.
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This is breaking change.
Currently
Node::datafield is public, but it is very strong restriction for internal representation of the node.Instead, it may be better to export
Node::get() -> &TandNode::get_mut() -> &mut T, and hideNode::datafield.See Future proofing - Rust API Guidelines.