A single set of curly braces is only used inside filters. It is the same as
{{foo}} outside of filters in that it transcludes the content of foo. {{{
[tag[foo]] }}} is a shorthand for the list widget and is not actually
related to the other uses.
The part that adds the square brackets has nothing to do with the { part,
some operators treat any input as a title list and some widgets treat their
output as a title list.
If an input is treated as a title list than any spaces will be used as
separators between items unless it is surrounded by [[ and ]], and outputs
from things that give title lists will put [[ and ]] around any items that
have spaces in the name.
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