feat: remove derive feature from arbitrary support

Cargo.toml

@@ -16,7 +16,7 @@ arbitrary = ["dep:arbitrary"]
 serde = ["dep:serde"]
 
 [dependencies]
-arbitrary = { version = "1", features = ["derive"], optional = true }
+arbitrary = { version = "1", optional = true }
 serde = { version = "1", optional = true }
 
 [dev-dependencies]

src/arbitrary.rs

@@ -0,0 +1,13 @@
+use arbitrary::{Arbitrary, Unstructured};
+
+use crate::ByteSize;
+
+impl Arbitrary<'_> for ByteSize {
+    fn arbitrary(u: &mut Unstructured<'_>) -> arbitrary::Result<Self> {
+        Ok(ByteSize(u64::arbitrary(u)?))
+    }
+
+    fn size_hint(depth: usize) -> (usize, Option<usize>) {
+        u64::size_hint(depth)
+    }
+}

src/lib.rs

@@ -27,6 +27,8 @@
 //! assert_eq!("518.0 GB", ByteSize::gb(518).to_string_as(false));
 //! ```
 
+#[cfg(feature = "arbitrary")]
+mod arbitrary;
 mod parse;
 #[cfg(feature = "serde")]
 mod serde;
@@ -105,7 +107,6 @@ pub fn pib<V: Into<u64>>(size: V) -> u64 {
 
 /// Byte size representation
 #[derive(Copy, Clone, PartialEq, PartialOrd, Eq, Ord, Hash, Default)]
-#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
 pub struct ByteSize(pub u64);
 
 impl ByteSize {