<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def bool(name, default=None, allow_none=False, fallback=None):
 """Get a boolean based environment value or the default. Args: name: The environment variable name default: The default value to use if no environment variable is found allow_none: If the return value can be `None` (i.e. optional) """

    value = read(name, default, allow_none, fallback=fallback)
    if isinstance(value, builtins.bool):
        return value
    elif isinstance(value, builtins.int):
        return True if value > 0 else False
    elif value is None and allow_none:
        return None
    else:
        value_str = builtins.str(value).lower().strip()
        return _strtobool(value_str)