utf8::decode() may actually unset the UTF-8 flag

According to the documentation, the utf8::decode() function should generally set/turn on the UTF-8 flag for a string that contains multi-byte characters.  However, apparently, there are circumstances under which utf8::decode() may not only not set the flag, but may actually unset/clear/turn off the flag for a string that contains multi-byte characters.

The following script contains 4 test cases . . . → Read More: utf8::decode() may actually unset the UTF-8 flag