Add MERITRANK_NO_ASSERT compile time option

README.md

@@ -3,3 +3,5 @@ MeritRank is a Rust library for computing merit scores and rankings in a directe
 
 Original `meritrank` is maintained by [Vladimir Radkevich](https://github.com/vsradkevich).
 
+## Compilation options
+- `MERITRANK_NO_ASSERT=1` - disable runtime asserts for better performance.

src/constants.rs

@@ -1,4 +1,4 @@
-pub const ASSERT                : bool = true;
+pub const ASSERT                : bool = std::option_env!("MERITRANK_NO_ASSERT").is_none();
 pub const VERBOSE               : bool = true;
 pub const OPTIMIZE_INVALIDATION : bool = true;
 pub const EPSILON               : f64  = 1e-6;