feat: Support smallvec from ShrinkToFit (#65)

Author: kdy1

Cargo.lock

@@ -30,6 +30,7 @@ rustc-hash                = "1.1.0"
 serde                     = "1.0.192"
 serde_derive              = "1.0.193"
 serde_json                = { version = "1", default-features = false }
+smallvec                  = { version = "1", default-features = false }
 syn                       = "2.0.39"
 toml_edit                 = "0.22.20"
 triomphe                  = "0.1.11"

Cargo.toml

@@ -4,7 +4,7 @@ edition     = { workspace = true }
 license     = { workspace = true }
 name        = "shrink-to-fit"
 repository  = { workspace = true }
-version     = "0.2.9"
+version     = "0.2.10"
 
 [package.metadata.docs.rs]
 all-features = true
@@ -15,13 +15,14 @@ hashbrown           = { workspace = true, optional = true, default-features = fa
 indexmap            = { workspace = true, optional = true, default-features = false }
 serde_json          = { workspace = true, optional = true, default-features = false }
 shrink-to-fit-macro = { version = "0.2.5", path = "../shrink-to-fit-macro", optional = true }
-
+smallvec            = { workspace = true, optional = true, default-features = false }
 
 [features]
 default    = ["derive"]
 derive     = ["dep:shrink-to-fit-macro"]
 hashbrown  = ["dep:hashbrown"]
 indexmap   = ["dep:indexmap"]
 serde_json = ["dep:serde_json"]
+smallvec   = ["dep:smallvec"]
 # Specialization for nightly. `ShrinkToFit` will be called for `T` in `Vec<T>` and collection elements if T implements `ShrinkToFit`.
 nightly = []

crates/shrink-to-fit/Cargo.toml

@@ -205,3 +205,13 @@ where
         self.shrink_to_fit();
     }
 }
+
+#[cfg(feature = "smallvec")]
+impl<T> ShrinkToFit for smallvec::SmallVec<T>
+where
+    T: smallvec::Array,
+{
+    fn shrink_to_fit(&mut self) {
+        self.shrink_to_fit();
+    }
+}