+All of the versions above return \true if the conversion was lossless and
+\false if at least one of the characters couldn't be converted and was replaced
+with {\tt '?'} in the output. Note that if {\tt wxCONVERT\_SUBSTITUTE} was
+passed to \helpref{Init}{wxencodingconverterinit}, substitution is considered
+lossless operation.
+