(t)
(nil)
(foo t)
[t ]

----------------------------------------------------

[
	["punctuation", "("], ["boolean", "t"], ["punctuation", ")"],
	["punctuation", "("], ["boolean", "nil"], ["punctuation", ")"],
	["punctuation", "("], ["car", "foo"], ["boolean", "t"], ["punctuation", ")"],
	["punctuation", "["], ["boolean", "t"], ["punctuation", "]"]
]

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Checks for booleans.