### 5.5 Comparators ¶

GNU libmu_sieve supports the following built-in comparators:

`i;octet`

  This comparator simply compares the two arguments octet by octet

`i;ascii-casemap`

  It treats uppercase and lowercase characters in the ASCII subset of UTF-8 as the same. This is the default comparator.

`i;ascii-numeric`

  Treats the two arguments as ASCII representation of decimal numbers and compares their numeric values. This comparator must be explicitly required prior to use.