from typing import List
import re


def has_caller_check_constraint(constraints: List) -> bool:
    """
    Checks whether the caller is constrained to a value or not
    """
    for constraint in constraints:
        if re.search(
            r"caller.*==[0-9]{20}", str(constraint).replace("\n", "").replace(" ", "")
        ):
            return False
    return True