Moderation consistency space versus comma

I wonder about the following logic (consistency flaw) as I feel it is prone for hand to find user error.

Usually, items in lists are separated by COMMA. However in Plugin Moderation there is a list separated by SPACES
Source: "These users may access the moderation tab. Space separated list of usernames. "
Reference: moderation.php:1323

Perhaps something to discuss between developers?

Thanks!