rustc-ap-serialize 123.0.0

Automatically published version of the package `serialize` in the rust-lang/rust repository from commit 428ea5f6b9e7c6e5ee3294fe9f105e77e89ab407 Thie publishing script for this crate lives at: https://github.com/alexcrichton/rustc-auto-publish
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Support code for encoding and decoding types.