Is upper_inc ever true for dateranges?

Hi. Regardless of how I specify a daterange, it is converted to inclusive
lower bound, exclusive upper bound ('[)'):

SELECT daterange('2019-01-01','2020-01-01','(]') AS range;
range
-------------------------
[2019-01-02,2020-01-02)

So here's my question. Will the upper_inc function always return false for
a non-null daterange? And if so, what's the point of the function? And/or
is it different for other kinds of ranges?

lower_inc at least seems to return true if lower bound is not null, but
false if it is null.

WITH r AS (SELECT daterange('2020-01-01','2020-01-31','(]') AS range)
SELECT range,upper_inc(range),lower_inc(range) FROM r;

range | upper_inc | lower_inc
-------------------------+-----------+-----------
[2020-01-02,2020-02-01) | f | t

range | upper_inc | lower_inc
---------------+-----------+-----------
[2020-01-02,) | f | t

range | upper_inc | lower_inc
---------------+-----------+-----------
(,2020-01-02) | f | f

Thanks in advance!

Ken

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