Canonicalization is simply the operation of reducing a possibly encoded string down to its simplest form.
      This is important, because attackers frequently use encoding to change their input in a way that will bypass validation filters,
      but still be interpreted properly by the target of the attack.
      Note that data encoded more than once is not something that a normal user would generate and should be regarded as an attack.

canonicalize(string input,boolean restrictMultiple,boolean restrictMixed):string

The arguments for this function are set. You can not use other arguments except the following ones.