# Buggy code
def check_valid_modification(module, values, modifiable_params):
    """Check if the parameters and values in values are valid."""
    changed_with_update = False

    for parameter in values:
        new_value = values[parameter]

        # check valid modifiable parameters
        if parameter not in modifiable_params:
            module.fail_json(
                msg="%s is not a modifiable parameter. Valid parameters to modify are: %s."
                % (parameter, modifiable_params.keys())
            )

        # check allowed datatype for modified parameters
        str_to_type = {"integer": int, "string": text_type}
        if not isinstance(new_value, str_to_type[modifiable_params[parameter][1]]):
            module.fail_json(
                msg="%s (type %s) is not an allowed value for the parameter %s. Expected a type %s."
                % (
                    new_value,
                    type(new_value),
                    parameter,
                    modifiable_params[parameter][1],
                )
            )

        # check allowed values for modifiable parameters
        if text_type(new_value) not in modifiable_params[parameter][
            0
        ] and not isinstance(new_value, int):
            module.fail_json(
                msg="%s is not an allowed value for the parameter %s. Valid parameters are: %s."
                % (new_value, parameter, modifiable_params[parameter][0])
            )

        # check if a new value is different from current value
        if text_type(new_value) != modifiable_params[parameter][2]:
            changed_with_update = True

    return changed_with_update


# Traceback (KeyError)
The full traceback is:
Traceback (most recent call last):
File "/tmp/ansible_wAJvSx/ansible_module_elasticache_parameter_group.py", line 330, in <module>
main()
File "/tmp/ansible_wAJvSx/ansible_module_elasticache_parameter_group.py", line 305, in main
modifiable_params = make_current_modifiable_param_dict(module, connection, parameter_group_name)
File "/tmp/ansible_wAJvSx/ansible_module_elasticache_parameter_group.py", line 156, in make_current_modifiable_param_dict
modifiable_params[param["ParameterName"]] = [param["AllowedValues"], param["DataType"], param["ParameterValue"]]
KeyError: 'AllowedValues'

fatal: [localhost]: FAILED! => {
"changed": false,
"failed": true,
"module_stderr": "Traceback (most recent call last):\n  File \"/tmp/ansible_wAJvSx/ansible_module_elasticache_parameter_group.py\", line 330, in <module>\n    main()\n  File \"/tmp/ansible_wAJvSx/ansible_module_elasticache_parameter_group.py\", line 305, in main\n    modifiable_params = make_current_modifiable_param_dict(module, connection, parameter_group_name)\n  File \"/tmp/ansible_wAJvSx/ansible_module_elasticache_parameter_group.py\", line 156, in make_current_modifiable_param_dict\n    modifiable_params[param[\"ParameterName\"]] = [param[\"AllowedValues\"], param[\"DataType\"], param[\"ParameterValue\"]]\nKeyError: 'AllowedValues'\n",
"module_stdout": "",
"msg": "MODULE FAILURE",
"rc": 0
}

# Fixed code
def check_valid_modification(module, values, modifiable_params):
    """Check if the parameters and values in values are valid."""
    changed_with_update = False

    for parameter in values:
        new_value = values[parameter]

        # check valid modifiable parameters
        if parameter not in modifiable_params:
            module.fail_json(
                msg="%s is not a modifiable parameter. Valid parameters to modify are: %s."
                % (parameter, modifiable_params.keys())
            )

        # check allowed datatype for modified parameters
        str_to_type = {"integer": int, "string": string_types}
        expected_type = str_to_type[modifiable_params[parameter][1]]
        if not isinstance(new_value, expected_type):
            if expected_type == str:
                if isinstance(new_value, bool):
                    values[parameter] = "yes" if new_value else "no"
                else:
                    values[parameter] = to_text(new_value)
            elif expected_type == int:
                if isinstance(new_value, bool):
                    values[parameter] = 1 if new_value else 0
                else:
                    module.fail_json(
                        msg="%s (type %s) is not an allowed value for the parameter %s. Expected a type %s."
                        % (
                            new_value,
                            type(new_value),
                            parameter,
                            modifiable_params[parameter][1],
                        )
                    )
            else:
                module.fail_json(
                    msg="%s (type %s) is not an allowed value for the parameter %s. Expected a type %s."
                    % (
                        new_value,
                        type(new_value),
                        parameter,
                        modifiable_params[parameter][1],
                    )
                )

        # check allowed values for modifiable parameters
        choices = modifiable_params[parameter][0]
        if choices:
            if not (to_text(new_value) in choices or isinstance(new_value, int)):
                module.fail_json(
                    msg="%s is not an allowed value for the parameter %s. Valid parameters are: %s."
                    % (new_value, parameter, choices)
                )

        # check if a new value is different from current value
        if to_text(values[parameter]) != modifiable_params[parameter][2]:
            changed_with_update = True

    return changed_with_update, values