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Yes, UTF-8 is a multi-byte character set, but no, UTF-8 and
mbcs are not synonyms. See

http://docs.python.org/lib/standard-encodings.html

for the documentation. encodings.aliases.aliases is no
registration - it is an alias databse. So if somebody refers
to "dbcs", this will be aliased to "mbcs". That does not
mean "mbcs" needs to be supported - it only means "dbcs" is
not supported on Linux, either.

tactis was never part of a Python release, so its lack is
not a bug.

Closing this report as invalid.