Add zerocopy support for UUID crate

.cargo/config.toml

@@ -0,0 +1,2 @@
+[build]
+rustflags = ["--cfg=uuid_unstable"]

Cargo.toml

@@ -13,12 +13,12 @@ rust-version = "1.67.1"
 
 [features]
 default = ["fast-rng"]
-arbitrary = ["uuid/arbitrary", "arbitrary/derive"]  # Add support for arbitrary types
-random = ["uuid/v4"]                                # Create random ShortGuid IDs
-fast-rng = ["random", "uuid/fast-rng"]             # Use a faster (but still sufficiently random) RNG
-serde = ["dep:serde", "uuid/serde"]                 # Serialization and deserialization support
-# zerocopy = ["dep:zerocopy", "uuid/zerocopy"]        # Zerocopy support
-bytemuck = ["dep:bytemuck", "uuid/bytemuck"]        # Bytemuck support
+arbitrary = ["uuid/arbitrary", "arbitrary/derive"]       # Add support for arbitrary types
+random = ["uuid/v4"]                                     # Create random ShortGuid IDs
+fast-rng = ["random", "uuid/fast-rng"]                   # Use a faster (but still sufficiently random) RNG
+serde = ["dep:serde", "uuid/serde"]                      # Serialization and deserialization support
+zerocopy = ["dep:zerocopy", "uuid/zerocopy"]             # Zerocopy support
+bytemuck = ["dep:bytemuck", "uuid/bytemuck"]             # Bytemuck support
 borsh = ["dep:borsh", "dep:borsh-derive", "uuid/borsh"]  # Borsh support
 
 [[example]]
@@ -42,7 +42,7 @@ zerocopy = { version = "0.7.33", optional = true, features = ["derive"] }
 
 [dev-dependencies]
 hex = "0.4.3"
-clap = "4.5.4"
+clap = "4.4.11"
 serde_test = "1.0.176"
 
 [package.metadata.docs.rs]

src/lib.rs

@@ -41,6 +41,9 @@ use std::fmt::{Debug, Display, Formatter};
 use std::str::FromStr;
 use uuid::Uuid;
 
+#[cfg(all(uuid_unstable, feature = "zerocopy"))]
+use zerocopy::{AsBytes, FromBytes, Unaligned};
+
 /// A short, URL-safe UUID representation.
 ///
 /// ## Example
@@ -67,10 +70,10 @@ use uuid::Uuid;
 /// ```
 #[derive(Default, Copy, Clone, Eq, PartialEq, Hash, Ord, PartialOrd)]
 #[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
-// #[cfg_attr(
-//      feature = "zerocopy",
-//      derive(zerocopy::AsBytes, zerocopy::FromBytes, zerocopy::Unaligned)
-// )]
+#[cfg_attr(
+    all(uuid_unstable, feature = "zerocopy"),
+    derive(AsBytes, FromBytes, Unaligned)
+)]
 #[cfg_attr(
     feature = "borsh",
     derive(borsh_derive::BorshDeserialize, borsh_derive::BorshSerialize)