String :: operator<= - Is left operand lower or equal

This operator is implemented for convenience fulfilling the case sensitive implementation of method compare(). The function return true, when the left string operand is lower than the right one or equal and false otherwise.

Comparison depends on the string coding type of the calling string (left operand). When encoding types between strings differ, a copy of the right operand is created and recoded to the encoding type of the left operator string.