[$] Python 3, ASCII, and UTF-8

The dreaded UnicodeDecodeError exception is one of the signature"features" of Python 3. It is raised when the language encounters a byte sequencethat it cannot decode into a string; strictly treating stringsdifferently from arrays of byte values was something that came withPython 3. Two Python Enhancement Proposals (PEPs) bound forPython 3.7 look toward reducing those errors (and the related UnicodeEncodeError) forenvironments where they are prevalent-and often unexpected.