Make recursive_count default within the derive crate.

Cargo.toml

@@ -20,7 +20,7 @@ documentation = "https://docs.rs/arbitrary/"
 rust-version = "1.63.0" # Keep in sync with version documented in the README.md
 
 [dependencies]
-derive_arbitrary = { version = "~1.4.0", path = "./derive", optional = true }
+derive_arbitrary = { version = "~1.4.0", path = "./derive", default-features = false, optional = true }
 
 [features]
 default = ["std", "recursive_count"]

derive/Cargo.toml

@@ -27,5 +27,6 @@ syn = { version = "2", features = ['derive', 'parsing', 'extra-traits'] }
 proc-macro = true
 
 [features]
+default = ["recursive_count"]
 # Checks for unbounded recursion at runtime. Requires `std`.
 recursive_count = []