[tex4ht] Decimal comma and specing (bug?)

[Karl Berry]

    The problem is, the tex4ht command is written in C and it seems that
    nobody understand it, so it is quite unlikely that we can fix it.

If someone can tell me how to change it, I expect the change can be
implemented.  The hard part is figuring out what to do.  I find the C
program more or less equally inscrutable with all other aspects of
tex4ht source, not especially worse (or better).  -k