BUG #18344: Pruning tables partitioned by bool range fails with invalid strategy

The following bug has been logged on the website:

Bug reference:      18344
Logged by:          Alexander Lakhin
Email address:      exclusion@gmail.com
PostgreSQL version: 16.2
Operating system:   Ubuntu 22.04
Description:

The following query:
CREATE TABLE t (b bool, i int) PARTITION BY RANGE (b, i);
CREATE TABLE tp PARTITION OF t FOR VALUES FROM (false, 0) TO (false, 1);
SELECT * FROM t WHERE b IS NOT true;

fails with ERROR:  invalid strategy number 0.

Reproduced on REL_12_STABLE .. master.
The first bad commit for this anomaly is e0693faf7.