type references fixed

src/gaspype/_operations.py

@@ -2,7 +2,8 @@ from typing import Literal, Any
 from math import exp
 from scipy.optimize import minimize, root
 import numpy as np
-from ._main import T, NDFloat, elements, fluid, fluid_system, FloatArray
+from ._main import T, elements, fluid, fluid_system
+from .typing import NDFloat, FloatArray
 from .constants import p0, epsy, R
 
 

src/gaspype/membrane.py

@@ -1,6 +1,7 @@
 from .constants import R, F
 from ._operations import oxygen_partial_pressure
-from ._main import fluid, elements, FloatArray
+from ._main import fluid, elements
+from .typing import FloatArray
 import numpy as np
 
 # Each O2 molecule is transported as two ions and each ion has a charged of 2e