Make: Put maratyszcza/fp16 in Crates

Closes #450

Co-authored-by: Michał Bartoszkiewicz <[email protected]>

Cargo.toml

@@ -18,10 +18,10 @@ include = [
 ]
 
 [features]
-default = ["simsimd"] # SimSIMD is enabled by default
-simsimd = []          # No need to do anything to enable SimSIMD by default
-openmp = []           # Optional: Users can enable OpenMP
-fp16lib = []          # Optional: Users can enable FP16 support
+default = ["simsimd", "fp16lib"] # SimSIMD is enabled by default
+simsimd = []                     # No need to do anything to enable SimSIMD by default
+fp16lib = []                     # Without this FP16 we lose precision downcasting
+openmp = []                      # Optional: Users can enable OpenMP
 
 [lib]
 name = "usearch"

rust/lib.rs

@@ -1639,6 +1639,28 @@ mod tests {
     }
 
     #[test]
+    fn test_zero_distances() {
+        let options = IndexOptions {
+            dimensions: 8,
+            metric: MetricKind::L2sq,
+            quantization: ScalarKind::F16,
+            ..Default::default()
+        };
+
+        let index = new_index(&options).unwrap();
+        index.reserve(10).unwrap();
+        index.add(0, &[0.4, 0.1, 0.1, 0.0, 0.0, 0.0, 0.0, 0.0]).unwrap();
+        index.add(1, &[0.5, 0.1, 0.1, 0.0, 0.0, 0.0, 0.0, 0.0]).unwrap();
+        index.add(2, &[0.6, 0.1, 0.1, 0.0, 0.0, 0.0, 0.0, 0.0]).unwrap();
+
+        // Make sure non of the distances are zeros
+        let matches = index.search(&[0.05, 0.1, 0.1, 0.0, 0.0, 0.0, 0.0, 0.0], 2).unwrap();
+        for distance in matches.distances.iter() {
+            assert_ne!(*distance, 0.0);
+        }        
+    }
+
+        #[test]
     fn test_change_distance_function() {
         let mut options = IndexOptions::default();
         options.dimensions = 2; // Adjusted for simplicity in creating test vectors