Wikimedia Bugzilla is closed!

For some reason, the mix of Wiki markup and the <sub> tag seems to work
peculiarly.  Consider &pi;<sub>''a''<sub>1</sub>,
...,''a''<sub>''n''</sub></sub>, which seems to be valid wikicode.  However, it
is rendered as &pi;<sub><i>a</i></sub>1, ..., <i>a</i><sub><i>n</i></sub> - that
is, the sub only spans over ''a'' and not a<sub>1</sub>, ...,
''a''<sub>''n''</sub> like it is supposed to.

Also note that &pi;<sub>''a<sub>1</sub>, ..., a<sub>n</sub>''</sub> works as
intended, but is different from the one above in the fact that 1 is also italicized.