copilot comment

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: marc-flex

tidy3d/components/spice/sources/dc.py

@@ -78,7 +78,7 @@ def check_voltage(cls, val):
     @pd.validator("voltage")
     def check_repeated_voltage(cls, val):
         """Warn if repeated voltage values are present, treating 0 and -0 as the same value."""
-        # Replace -0.0 with 0.0 to ensure they are treated as duplicates
+        # Normalize all zero values (both 0.0 and -0.0) to 0.0 so they are treated as duplicates
         normalized = np.where(val == 0, 0.0, val)
         unique_values = np.unique(normalized)
         if len(unique_values) < len(val):