+_bench_unstable = []
+# Override signing to not include randomness when generating signatures for test vectors.
+_test_vectors = []
+
+no-std = ["hashbrown", "bitcoin/no-std", "core2/alloc"]
+std = ["bitcoin/std"]
+
+# Generates low-r bitcoin signatures, which saves 1 byte in 50% of the cases
+grind_signatures = []
+
+default = ["std", "grind_signatures"]