Wikimedia Bugzilla is closed!

Adding default values in form {{{arg|val}}} would enhance templates without adding much complexity. This would 
solve several issues and ease use of templates in many situations:

- Adding a new argument to the existing template would not be so painfull (currently you have to add argument to 
every place template is used, but that may be very long process)
- Usage of templates for infoboxes with many optional arguments could be more readable (no need to assign empty 
value for every not used argument - these values would be inlcluded in template definition)

Extending a format this way would be safe enough to include in existing wiki sites as '|' character was never used in 
{{{ parentheses, so nothing will be broken.