Please solve the programming task below using a self-contained code snippet in a markdown code block.

An axis-aligned rectangle is represented as a list [x1, y1, x2, y2], where (x1, y1) is the coordinate of its bottom-left corner, and (x2, y2) is the coordinate of its top-right corner. Its top and bottom edges are parallel to the X-axis, and its left and right edges are parallel to the Y-axis.
Two rectangles overlap if the area of their intersection is positive. To be clear, two rectangles that only touch at the corner or edges do not overlap.
Given two axis-aligned rectangles rec1 and rec2, return true if they overlap, otherwise return false.
 
Please complete the following python code precisely:
```python
class Solution:
    def isRectangleOverlap(self, rec1: List[int], rec2: List[int]) -> bool:
```