rustc-ap-serialize 610.0.0

Automatically published version of the package `serialize` in the rust-lang/rust repository from commit 4b42e919d640f7c714a7e87c91b4f3a9089552d0 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish

Support code for encoding and decoding types.