Merge pull request #93 from Point72/tkp/fixes

Fix type annotation for `csp.apply`

Author: timkpaine

csp/baselib.py

@@ -423,7 +423,7 @@ def bitwise_not(x: ts[int]) -> ts[int]:
 
 
 @node()
-def apply(x: ts["T"], f: object, result_type: "U") -> ts["U"]:
+def apply(x: ts["T"], f: typing.Callable[["T"], "U"], result_type: "U") -> ts["U"]:
     """
     :param x: The time series on which the function should be applied
     :param f: A scalar function that will be applied on each value of x