Update comment about conversion from np.float32 to C++ int

Author: YannickJadoul

tests/test_builtin_casters.py

@@ -308,7 +308,8 @@ def require_implicit(v):
     assert convert(np.intc(42)) == 42
     assert noconvert(np.intc(42)) == 42
 
-    assert convert(np.float32(3.14159)) == 3  # This might be wrong/unwanted?
+    # The implicit conversion from np.float32 is undesirable but currently accepted.
+    assert convert(np.float32(3.14159)) == 3
     require_implicit(np.float32(3.14159))