shorewall : error messages at startup

Starting shorewall4 or shorewall6 gives the following error message.

# /etc/init.d/shorewall start
 * Starting shorewall ...
sh: recursive: unknown operand
find: invalid number '-type'
sh: recursive: unknown operand
find: invalid number '-type'

The issue seems to be with the comparisons done in /usr/share/shorewall/lib.cli-std at lines 408 and 415.

(from redmine: issue id 10159, created on 2019-03-26)