Change default hash to PHASH2

PHASH2 is guaranteed to be stable across ERTS instance boundaries, hence
making this hashing algorihtm more stable.

This change is expected to reduce the friction for users, as terms will
always hash equal, no matter the ERTS version and instance.

Author: brodeuralexis

c_include/fine.hpp

@@ -1128,7 +1128,7 @@ template <> struct Hasher<Term> {
 };
 } // namespace __private__
 
-template <HashAlgorithm A = HashAlgorithm::INTERNAL, typename T>
+template <HashAlgorithm A = HashAlgorithm::PHASH2, typename T>
 inline static std::uint64_t hash(const T &value, std::uint64_t salt = 0) {
   return __private__::Hasher<T>::hash(A, value, salt);
 }
@@ -1199,13 +1199,13 @@ inline static std::uint64_t hash(HashAlgorithm algorithm, const T &value,
 namespace std {
 template <> struct hash<::fine::Term> {
   size_t operator()(const ::fine::Term &term) noexcept {
-    return ::fine::hash(term);
+    return ::fine::hash<::fine::HashAlgorithm::PHASH2>(term);
   }
 };
 
 template <> struct hash<::fine::Atom> {
   size_t operator()(const ::fine::Term &term) noexcept {
-    return ::fine::hash(term);
+    return ::fine::hash<::fine::HashAlgorithm::PHASH2>(term);
   }
 };
 } // namespace std