[SMARTY] Curly braces inside a function argument

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How can put curly braces inside of a function argument?  Is it not
possible?  everything I've tried doesn't seem to work:

{myfunc test="foo {bar}"}
{myfunc test='foo {bar}'}
{myfunc test="foo {ldelim}bar{rdelim}"}

No matter what, smarty always percieves the first closing brace as the
closing brace for the function itself.   Should this be considered a bug?

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