>>-caselessChangeStr(needle,newneedle--+--------+--)---------------------------------><
                                       +-,count-+

Returns the receiver MutableBuffer newneedle replacing occurrences of needle. If count is not specified, all occurrences of needle are replaced. If count is specified, it must be a positive, whole number that gives the maximum number of occurrences to be replaced. The needle searches are performed using caseless comparisons.