<s>[INST] Write a python function to calculate the volume of a truncated cone. Include a doc-string and comments. The function should adhere to PEP8 and be production ready. [/INST] ```python
def volume_of_truncated_cone(height: float, upper_radius: float, lower_radius: float) -> float:
    """
    This function calculates the volume of a truncated cone.

    Arguments:
        height (float): The height of the truncated cone.
        upper_radius (float): The radius of the upper circle.
        lower_radius (float): The radius of the lower circle.

    Returns:
        float: The volume of the truncated cone.
    """
    # Calculate the volume of the truncated cone using the formula.
    pi = 3.14159  # Define the constant pi.
    volume = (1 / 3) * pi * height * (upper_radius ** 2 + upper_radius * lower_radius + lower_radius ** 2)

    return volume
```</s>\ <s>[INST] What should users consider when using this function? [/INST] Here are some considerations that might be important:
- Variable type. This function takes `float` variables as inputs and the output, therefore users should be aware of the upper/lower limit and the loss in precision from type conversion.
- Precision. This function approximates pi as 3.14159, and the `float` type can't represented all decimal numbers exactly. Users should be careful when using it for high-precision calculations.</s>\ <s>[INST] Could you please break down the code even further, explaining more about what each step does. [/INST] 