Fix to_rgba when alpha is a numpy type

Author: has2k1

mizani/_colors/utils.py

@@ -2,6 +2,8 @@
 
 from typing import TYPE_CHECKING, overload
 
+import numpy as np
+
 from mizani._colors.named_colors import get_named_color
 
 if TYPE_CHECKING:
@@ -104,7 +106,7 @@ def to_rgba(
         if colors == "none" or colors == "None":
             return "none"
 
-        if isinstance(alpha, (float, int)):
+        if isinstance(alpha, (float, int, np.floating, np.integer)):
             c = get_named_color(colors)
             if len(c) > 7:
                 return c

tests/colors/test_utils.py

@@ -1,3 +1,4 @@
+import numpy as np
 import pandas as pd
 import pytest
 
@@ -26,6 +27,8 @@ def test_to_rgba():
 
     assert to_rgba((0, 0, 1, 0.2), 1) == (0, 0, 1, 0.2)
     assert to_rgba("none", 0.5) == "none"
+    assert to_rgba("red", np.float64(0.5)) == "#FF000080"
+    assert to_rgba("red", np.int64(1)) == "#FF0000FF"  # pyright: ignore[reportCallIssue,reportArgumentType]
 
     with pytest.raises(ValueError):
         to_rgba("red", "0")  # pyright: ignore[reportCallIssue,reportArgumentType]