adds pymbolic.typing

pymbolic/typing.py

+from pymbolic.primitives import Expression
+from numbers import Number
+from typing import Union
+
+try:
+    import numpy as np
+except ImportError:
+    BoolT = bool
+else:
+    BoolT = Union[bool, np.bool_]
+
+
+ScalarT = Union[Number, int, BoolT, float]
+ExpressionT = Union[ScalarT, Expression]