rustc-ap-serialize 463.0.0

Automatically published version of the package `serialize` in the rust-lang/rust repository from commit 33cde4aac2ec1b0a493d0acaa4c4fb45de0c6e94 The publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish

Support code for encoding and decoding types.