The special object, t, is a logically true value which has no other meaning. All Gamma objects other than nil are logically true, but only the special object t is the logical negation of nil. t is created by a call to not(nil), or by reading the symbol t.
The predicate true_p explicitly tests for the value t. However, in all conditional statements, any non-nil value is considered to be true for the purpose of the test.
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