Cell padding in RTF code has multiple command words associated with it.
Huxtable uses the command word \clpad<t,b,l,r>N to control the cell padding.
This command word is additionally controlled by the command word
\clpadf<t,b,l,r>N. There are two possible values for N in \clpadf<t,b,l,r>N:
The ignore_cell_padding function toggles the \clpadf<t,b,l,r>N command words
in the RTF document to 0 instead of 3. By using Word 97 style cell padding,
the minimum amount of space is closer than using the 0 twips setting when the
RTF is rendered inside Word. This effectively closes the gap between rows,
which may be a desirable appearance in some outputs.
More information on these RTF settings can be found
here.