> But, it also leaves an "undefined" in the tiddler where the script is.
store.setTiddlerTag() does not return a value, so you get "undefined"
as output when it occurs in the 'write' clause. To return a blank
string instead of undefined, try adding an extra ""; following the
call to setTiddlerTag(), like this:
<<forEachTiddler
where
'tiddler.tags.containsAll(["foo"])'
write
'store.setTiddlerTag(tiddler.title,true,"bar");"";'
-e
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