[Active Records] Disabling the protection of identifiers

[eluser]Clooner[/eluser]
The following statement gives me problems

Code:

$this->db->select('round(produces.price*produces.discount*'.vat().',2) as price');

It causes problems because vat() returns a value of 1.19.

This will generate mysql code which is invalid.

Code:

`round(produces`.`price*produces`.`discount*1`.`19`, `2)`

I tried to use $this->db->protect_identifiers but this function doesn't allow you to disable the backticks. How can I disable the backticks generated for the 1.19 value?