Implements the "i;ascii-casemap" collation from RFC 4790.
The "i;ascii-casemap" collation is a simple collation that operates on octet strings and treats US-ASCII letters case-insensitively. It provides equality, substring, and ordering operations. All input is valid. Note that letters outside ASCII are not treated case- insensitively.
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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