Add rkyv support

Adds support for rust-lang/rust#153283

Author: aDotInTheVoid

.github/workflows/CI.yml

@@ -12,13 +12,11 @@ env:
 jobs:
   cargo-test:
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        features:
-          - default
-          - rustc-hash
     steps:
     - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@stable
+    - uses: taiki-e/install-action@a37010ded18ff788be4440302bd6830b1ae50d8b # v2.68.25
+        with:
+          tool: cargo-hack@0.6.43
     - uses: Swatinem/rust-cache@v2
-    - run: cargo test --no-default-features --features '${{ matrix.features }}'
+    - run: cargo hack test --feature-powerset

COMMIT.txt

@@ -1 +1 @@
-931e2c4e43fde6a308ee9933538142ed0927f6d9
+1d81c5021a21453e77ca2a0cd7f2a8006e9775ae

Cargo.toml

@@ -12,15 +12,13 @@ include = ["Cargo.toml", "CHANGELOG.md", "README.md", "LICENSE-MIT", "LICENSE-AP
 serde = {version="1.0.186"}
 serde_derive = {version="1.0.186"}
 rustc-hash = {version="2", optional=true}
+rkyv = { version = "0.8", optional = true }
 
 [features]
-default = []
+default = [] # TODO: Remove this next time we make a breaking release
 
-# Switch the hashmaps used in rustdoc-types to the FxHashMap from rustc-hash.
-#
-# This might improve performace if your are reading the rustdoc JSON from large
-# crates like aws_sdk_ec2
 rustc-hash = ["dep:rustc-hash"]
+rkyv_0_8 = ["dep:rkyv"]
 
 [dev-dependencies]
 bincode = "1.3.3"