Implements the "i;octet" collation from RFC 4790.
The "i;octet" collation is a simple and fast collation intended for use on binary octet strings rather than on character data. Protocols that want to make this collation available have to do so by explicitly allowing it. If not explicitly allowed, it MUST NOT be used. It never returns an "undefined" result. It provides equality, substring, and ordering operations.
Returns -1, 0, or 1 if a is smaller than, equal to, or greater than b, respectively.
Returns true if b is a substring of a, and false otherwise.
Returns true if a is equal to b, and false otherwise.
Returns true (all input strings are valid).
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