Should the parenthesis be part of the tag name?

If not how do you think the "hidden" flag for a tag should be stored in the tiddler? Currently a tag is just an item in an array of strings.

Alternatively I suggest to maintain a list of tags that should not be displayed in "View mode". A function "TiddlyWiki.prototype.isHiddenTag(tag)" could be used to check if a tag is "hidden". This function would be used in the view mode to check if a tag should be displayed or not.

As a standard implementation for isHiddenTag we could use a "HiddenTags?" tiddler containing a list of tags (similar to the DefaultTiddlers? tiddler). By defining a shadowTiddler "HiddenTags?" one could defined some tags that should be hidden by default, but for every TiddlyWiki this list could be overwritten by explicitly defining a "HiddenTags?" tiddler.

Later someone may overwrite the "isHiddenTag" function to use a different policy to detect if a tag is "hidden" (i.e. should not be displayed in the "view" mode).