diff --git a/src/copapy/_mixed.py b/src/copapy/_mixed.py
new file mode 100644
index 0000000..e4d2632
--- /dev/null
+++ b/src/copapy/_mixed.py
@@ -0,0 +1,24 @@
+
+from . import variable
+from typing import TypeVar, Iterable, Any, overload
+
+T = TypeVar("T", int, float)
+
+
+@overload
+def mixed_sum(scalars: Iterable[float | variable[float]]) -> float | variable[float]: ...
+@overload
+def mixed_sum(scalars: Iterable[int | variable[int]]) -> int | variable[int]: ...
+@overload
+def mixed_sum(scalars: Iterable[T | variable[T]]) -> T | variable[T]: ...
+def mixed_sum(scalars: Iterable[int | float | variable[Any]]) -> Any:
+    sl = list(scalars)
+    return sum(a for a in sl if not isinstance(a, variable)) +\
+           sum(a for a in sl if isinstance(a, variable))
+
+
+def mixed_homogenize(scalars: Iterable[T | variable[T]]) -> Iterable[T] | Iterable[variable[T]]:
+    if any(isinstance(val, variable) for val in scalars):
+        return (variable(val) if not isinstance(val, variable) else val for val in scalars)
+    else:
+        return (val for val in scalars if not isinstance(val, variable))
diff --git a/src/copapy/_vectors.py b/src/copapy/_vectors.py
index 3d8a721..e6fbf40 100644
--- a/src/copapy/_vectors.py
+++ b/src/copapy/_vectors.py
@@ -1,4 +1,5 @@
 from . import variable
+from ._mixed import mixed_sum, mixed_homogenize
 from typing import Generic, TypeVar, Iterable, Any, overload, TypeAlias, Callable, Iterator
 import copapy as cp
 
@@ -31,7 +32,7 @@ class vector(Generic[T]):
     def __getitem__(self, index: int) -> variable[T] | T:
         return self.values[index]
 
-    def __neg__(self) -> 'vector[float] | vector[int]':
+    def __neg__(self) -> 'vector[T]':
         return vector(-a for a in self.values)
 
     def __iter__(self) -> Iterator[variable[T] | T]:
@@ -125,7 +126,7 @@ class vector(Generic[T]):
     def dot(self, other: 'vector[int] | vector[float]') -> float | int | variable[float] | variable[int]: ...
     def dot(self, other: 'vector[int] | vector[float]') -> Any:
         assert len(self.values) == len(other.values), "Vectors must be of same length."
-        return sum(a * b for a, b in zip(self.values, other.values))
+        return mixed_sum(a * b for a, b in zip(self.values, other.values))
 
     # @ operator
     @overload
@@ -156,13 +157,12 @@ class vector(Generic[T]):
     def sum(self: 'vector[float]') -> float | variable[float]: ...
     def sum(self) -> Any:
         """Sum of all vector elements."""
-        return sum(a for a in self.values if isinstance(a, variable)) +\
-               sum(a for a in self.values if not isinstance(a, variable))
+        return mixed_sum(self.values)
 
     def magnitude(self) -> 'float | variable[float]':
         """Magnitude (length) of the vector."""
-        s = sum(a * a for a in self.values)
-        return cp.sqrt(s) if isinstance(s, variable) else cp.sqrt(s)
+        s = mixed_sum(a * a for a in self.values)
+        return cp.sqrt(s)
 
     def normalize(self) -> 'vector[float]':
         """Returns a normalized (unit length) version of the vector."""
@@ -171,7 +171,7 @@ class vector(Generic[T]):
     
     def homogenize(self) -> 'vector[T]':
         if any(isinstance(val, variable) for val in self.values):
-            return vector(variable(val) if not isinstance(val, variable) else val for val in self.values)
+            return vector(mixed_homogenize(self))
         else:
             return self