The problem is a hack in mysqltest.c::append_field that modifies
the exponential notation of floating point numbers by removing a
zero after the the symbol 'e' (eg: 00001.2e+018 is converted to
00001.2e+18) but does not take into account the zerofill affect
in the start of the string.

The solution is to check if the field was zero filled and insert
a zero at the start of the string if a zero after the exponential
notation symbol is removed.