Support serde by default.

This removes the `serialization-serde` feature, since serde is already
used internally and therefore a dependency anyway.

mod.rs

@@ -2,7 +2,6 @@ pub mod error;
 pub mod poly;
 #[cfg(feature = "serialization-protobuf")]
 pub mod protobuf_impl;
-#[cfg(feature = "serialization-serde")]
 mod serde_impl;
 
 use self::poly::{Commitment, Poly};
@@ -179,8 +178,7 @@ impl<E: Engine> PartialEq for DecryptionShare<E> {
 }
 
 /// A public key and an associated set of public key shares.
-#[cfg_attr(feature = "serialization-serde", derive(Serialize, Deserialize))]
-#[derive(Clone, Debug)]
+#[derive(Serialize, Deserialize, Clone, Debug)]
 pub struct PublicKeySet<E: Engine> {
     /// The coefficients of a polynomial whose value at `0` is the "master key", and value at
     /// `i + 1` is key share number `i`.
@@ -526,7 +524,6 @@ mod tests {
         assert_eq!(20, hash(g0, 20).len());
     }
 
-    #[cfg(feature = "serialization-serde")]
     #[test]
     fn test_serde() {
         use bincode;

poly.rs

@@ -248,11 +248,10 @@ impl<E: Engine> Poly<E> {
 }
 
 /// A commitment to a univariate polynomial.
-#[derive(Debug, Clone)]
-#[cfg_attr(feature = "serialization-serde", derive(Serialize, Deserialize))]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct Commitment<E: Engine> {
     /// The coefficients of the polynomial.
-    #[cfg_attr(feature = "serialization-serde", serde(with = "super::serde_impl::projective_vec"))]
+    #[serde(with = "super::serde_impl::projective_vec")]
     coeff: Vec<E::G1>,
 }
 
@@ -395,13 +394,12 @@ impl<E: Engine> BivarPoly<E> {
 }
 
 /// A commitment to a bivariate polynomial.
-#[derive(Debug, Clone)]
-#[cfg_attr(feature = "serialization-serde", derive(Serialize, Deserialize))]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct BivarCommitment<E: Engine> {
     /// The polynomial's degree in each of the two variables.
     degree: usize,
     /// The commitments to the coefficients.
-    #[cfg_attr(feature = "serialization-serde", serde(with = "super::serde_impl::projective_vec"))]
+    #[serde(with = "super::serde_impl::projective_vec")]
     coeff: Vec<E::G1>,
 }