Add serde support

Cargo.toml

@@ -16,6 +16,7 @@ typenum = "1.16"
 num-traits = { version = "0.2", default-features = false }
 defmt = { version = "0.3", optional = true }
 fixed = { version = "1.23.0", optional = true }
+serde = { version = "1.0", default-features = false, features = ["derive"] }
 
 [features]
 default = ["std"]
@@ -23,3 +24,4 @@ defmt = ["dep:defmt"]
 fixed = ["dep:fixed"]
 std = ["num-traits/std"]
 nightly = []
+serde = ["dep:serde"]

src/lib.rs

@@ -21,6 +21,7 @@ use typenum::{int::Z0, op, Integer};
 use types::Unit;
 
 #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Clone, Copy)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct SiUnit<T, Second, Metre, Kilogram, Ampere, Kelvin, Mole, Candela>
 where
     Second: Integer,