The Python value True. This value is guaranteed to be the unique value associated to True.

Py.is_true v is true if and only if v is True. Since Py.Bool.t is guaranteed to be the unique value associated to True, Py.is_true v is equivalent to v == Py.t.

The Python value False. This value is guaranteed to be the unique value associated to False.

Py.is_false v is true if and only if v is False. Since Py.Bool.f is guaranteed to be the unique value associated to False, Py.is_false f is equivalent to v == Py.f.

check v returns true if v = t or v = f.

of_bool b returns t if b = true, and f if b = false.

to_bool b returns true if b = t, and false if b = f. Failure is raised if b is neither t nor f.