Just use serde as a feature directly

Cargo.toml

@@ -33,15 +33,11 @@ default = [
   "mio-uds",
   "num_cpus",
   "pin-project-lite",
-  "serde-support",
+  "serde",
 ]
 docs = ["attributes", "unstable"]
 unstable = ["default", "broadcaster"]
 attributes = ["async-attributes"]
-serde-support = [
-  "default",
-  "serde",
-]
 std = [
   "async-macros",
   "crossbeam-utils",

src/path/pathbuf.rs

@@ -13,16 +13,16 @@ use crate::path::Path;
 use crate::prelude::*;
 #[cfg(feature = "unstable")]
 use crate::stream::{self, FromStream, IntoStream};
-#[cfg(feature = "serde-support")]
+#[cfg(feature = "serde")]
 use serde::{Serialize, Deserialize};
 
 /// This struct is an async version of [`std::path::PathBuf`].
 ///
 /// [`std::path::Path`]: https://doc.rust-lang.org/std/path/struct.PathBuf.html
-#[cfg_attr(feature = "serde-support", derive(Serialize, Deserialize))]
+#[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 #[derive(Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct PathBuf {
-    #[cfg_attr(feature = "serde-support", serde(flatten))]
+    #[cfg_attr(feature = "serde", serde(flatten))]
     inner: std::path::PathBuf,
 }