Fix rounding inconsistency in split totals

percentify/stats.py

@@ -892,6 +892,9 @@ def split(total, weights, decimals: Optional[int] = 2):
     shares = w.astype(float) / weight_sum * float(total)
     if decimals is not None:
         shares = shares.round(decimals)
+        remainder = round(float(total), decimals) - float(shares.sum())
+        if remainder:
+            shares.iloc[-1] = round(shares.iloc[-1] + remainder, decimals)
     return shares if is_series else shares.tolist()
 
 

tests/test_stats.py

@@ -609,7 +609,9 @@ def test_split_list():
 
 
 def test_split_equal():
-    assert split(100, [1, 1, 1]) == [pytest.approx(33.33)] * 3
+    result = split(100, [1, 1, 1])
+    assert result == [33.33, 33.33, 33.34]
+    assert sum(result) == 100
 
 
 def test_split_series_returns_series():