Strict warning: Declaration of webform_exporter_excel_xlsx::eof()

The webform_exporter defines the eof function as:
function eof(&$file_handle) {

The webform_exported_excel_xlsx defines the eof function as:
function eof(&$file_handle, $row_count, $col_count) {

This causes the php Strict warning.

Perhaps they base class could have those two variables defined, but initialized to NULL?