From a27e0c850dde5aee60c08742e9e5af0ddb4a7cc9 Mon Sep 17 00:00:00 2001
From: William Woodruff <william@astral.sh>
Date: Mon, 5 Jan 2026 17:57:35 -0500
Subject: [PATCH] Use Cow<str> for deserialization everywhere (#17330)

---
 crates/uv-build-backend/src/metadata.rs       | 8 ++++++--
 crates/uv-build-backend/src/serde_verbatim.rs | 8 ++++++--
 crates/uv-fs/src/path.rs                      | 4 ++--
 crates/uv-normalize/src/group_name.rs         | 3 +--
 crates/uv-pypi-types/src/identifier.rs        | 3 +--
 crates/uv-python/src/discovery.rs             | 2 +-
 crates/uv-resolver/src/exclude_newer.rs       | 3 +--
 7 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/crates/uv-build-backend/src/metadata.rs b/crates/uv-build-backend/src/metadata.rs
index e45670a6e..8752cc15b 100644
--- a/crates/uv-build-backend/src/metadata.rs
+++ b/crates/uv-build-backend/src/metadata.rs
@@ -1,3 +1,4 @@
+use std::borrow::Cow;
 use std::collections::{BTreeMap, Bound};
 use std::ffi::OsStr;
 use std::fmt::Display;
@@ -123,9 +124,12 @@ impl<'de> Deserialize<'de> for VerbatimPackageName {
     where
         D: Deserializer<'de>,
     {
-        let given = String::deserialize(deserializer)?;
+        let given = <Cow<'_, str>>::deserialize(deserializer)?;
         let normalized = PackageName::from_str(&given).map_err(serde::de::Error::custom)?;
-        Ok(Self { given, normalized })
+        Ok(Self {
+            given: given.to_string(),
+            normalized,
+        })
     }
 }
 
diff --git a/crates/uv-build-backend/src/serde_verbatim.rs b/crates/uv-build-backend/src/serde_verbatim.rs
index fc7a9b3ff..7050ebd6a 100644
--- a/crates/uv-build-backend/src/serde_verbatim.rs
+++ b/crates/uv-build-backend/src/serde_verbatim.rs
@@ -1,4 +1,5 @@
 use serde::{Deserialize, Deserializer, Serialize, Serializer};
+use std::borrow::Cow;
 use std::fmt::{Display, Formatter};
 use std::ops::Deref;
 use std::str::FromStr;
@@ -38,9 +39,12 @@ where
     where
         D: Deserializer<'de>,
     {
-        let verbatim = String::deserialize(deserializer)?;
+        let verbatim = <Cow<'_, str>>::deserialize(deserializer)?;
         let inner = T::from_str(&verbatim).map_err(serde::de::Error::custom)?;
-        Ok(Self { verbatim, inner })
+        Ok(Self {
+            verbatim: verbatim.to_string(),
+            inner,
+        })
     }
 }
 
diff --git a/crates/uv-fs/src/path.rs b/crates/uv-fs/src/path.rs
index d3993cd99..231255f87 100644
--- a/crates/uv-fs/src/path.rs
+++ b/crates/uv-fs/src/path.rs
@@ -430,11 +430,11 @@ impl<'de> serde::de::Deserialize<'de> for PortablePathBuf {
     where
         D: serde::de::Deserializer<'de>,
     {
-        let s = String::deserialize(deserializer)?;
+        let s = <Cow<'_, str>>::deserialize(deserializer)?;
         if s == "." {
             Ok(Self(PathBuf::new().into_boxed_path()))
         } else {
-            Ok(Self(PathBuf::from(s).into_boxed_path()))
+            Ok(Self(PathBuf::from(s.as_ref()).into_boxed_path()))
         }
     }
 }
diff --git a/crates/uv-normalize/src/group_name.rs b/crates/uv-normalize/src/group_name.rs
index 405907c1f..10bd94b55 100644
--- a/crates/uv-normalize/src/group_name.rs
+++ b/crates/uv-normalize/src/group_name.rs
@@ -1,4 +1,3 @@
-#[cfg(feature = "schemars")]
 use std::borrow::Cow;
 use std::fmt::{Display, Formatter};
 use std::path::PathBuf;
@@ -148,7 +147,7 @@ impl<'de> Deserialize<'de> for PipGroupName {
     where
         D: Deserializer<'de>,
     {
-        let s = String::deserialize(deserializer)?;
+        let s = <Cow<'_, str>>::deserialize(deserializer)?;
         Self::from_str(&s).map_err(serde::de::Error::custom)
     }
 }
diff --git a/crates/uv-pypi-types/src/identifier.rs b/crates/uv-pypi-types/src/identifier.rs
index 7ce496ff0..c3adfa8f6 100644
--- a/crates/uv-pypi-types/src/identifier.rs
+++ b/crates/uv-pypi-types/src/identifier.rs
@@ -1,5 +1,4 @@
 use serde::{Serialize, Serializer};
-#[cfg(feature = "schemars")]
 use std::borrow::Cow;
 use std::fmt::Display;
 use std::str::FromStr;
@@ -85,7 +84,7 @@ impl<'de> serde::de::Deserialize<'de> for Identifier {
     where
         D: serde::de::Deserializer<'de>,
     {
-        let s = String::deserialize(deserializer)?;
+        let s = <Cow<'_, str>>::deserialize(deserializer)?;
         Self::from_str(&s).map_err(serde::de::Error::custom)
     }
 }
diff --git a/crates/uv-python/src/discovery.rs b/crates/uv-python/src/discovery.rs
index 29659116c..c40fe894b 100644
--- a/crates/uv-python/src/discovery.rs
+++ b/crates/uv-python/src/discovery.rs
@@ -74,7 +74,7 @@ impl<'a> serde::Deserialize<'a> for PythonRequest {
     where
         D: serde::Deserializer<'a>,
     {
-        let s = String::deserialize(deserializer)?;
+        let s = <Cow<'_, str>>::deserialize(deserializer)?;
         Ok(Self::parse(&s))
     }
 }
diff --git a/crates/uv-resolver/src/exclude_newer.rs b/crates/uv-resolver/src/exclude_newer.rs
index 913b3f22d..c7986c0ce 100644
--- a/crates/uv-resolver/src/exclude_newer.rs
+++ b/crates/uv-resolver/src/exclude_newer.rs
@@ -1,4 +1,3 @@
-#[cfg(feature = "schemars")]
 use std::borrow::Cow;
 use std::{
     ops::{Deref, DerefMut},
@@ -197,7 +196,7 @@ impl<'de> serde::Deserialize<'de> for ExcludeNewerSpan {
     where
         D: serde::Deserializer<'de>,
     {
-        let s = String::deserialize(deserializer)?;
+        let s = <Cow<'_, str>>::deserialize(deserializer)?;
         let span: Span = s.parse().map_err(serde::de::Error::custom)?;
         Ok(Self(span))
     }