diff -r 4e80fb049dca -r 2e4517b55442 Cargo.toml
--- a/Cargo.toml	Sun Apr 27 15:56:43 2025 -0500
+++ b/Cargo.toml	Sun Apr 27 20:41:36 2025 -0500
@@ -40,6 +40,11 @@
 debug = true
 
 [features]
-default = ["nightly"]
+default = []
 use_custom_thread_pool = []
-nightly = []                # enable for higher-performance implementations of some things
+# The nightly feature enables some additional features.
+# Nightly-based optimisations are decided automatically by build.rs.
+nightly = []
+
+[build-dependencies]
+rustc_version = "0.4"