Our playground now supports serde_derive and lets crate authors control what features the crate exposes! http://play.integer32.com/?gist=f0df3e1b9f1ff67a1e9ed4f96754d408 … #rustlang
Rust versions are automatic every day. Library updates are manual and whenever we remember 
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Libs tend to require a bit more hand holding to avoid dependency conflicts or ensure dependencies are present.
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