"""Extracts and processes a JSON-like object from a string enclosed within specific markers.

The function searches for a substring enclosed between `<|begin_of_box|>` and `<|end_of_box|>` markers. If found, it processes the substring to handle leading zeros in numeric arrays and attempts to parse it as a JSON object. If JSON parsing fails, it evaluates the string as a Python expression with specific mappings for 'true', 'false', and 'null'.

Args:
    s (str): The input string containing the potential JSON-like object enclosed within markers.

Returns:
    dict or None: The parsed JSON-like object if successful, otherwise None.

Special Rules:
    - The function returns None if the markers `<|begin_of_box|>` or `<|end_of_box|>` are not found in the input string.
    - Numeric arrays within the substring are processed to remove leading zeros (e.g., `[[ 1, 2, 3, 4 ]]` becomes `[[1,2,3,4]]`).
    - If JSON parsing fails, the function evaluates the string as a Python expression, mapping 'true' to True, 'false' to False, and 'null' to None.
"""
You should write code starting with:
import json
import re

def extract_answer_obj(s: str) -> dict | None:
    # TODO: Implement this function
    pass

