I hope that：
in the https://www.postgresql.org/docs/14/datatype-characterin.html ，It needs to be written clearly “bpchar” data type，
and in the above url, Only mentioned “blank padded” ，If someone does not know this knowledge point（blank padded =bp），he/she will make a detour in the study of character datatype。
so，To make the document more friendly, I suggest that： in the https://www.postgresql.org/docs/14/datatype-characterin.htm ，It needs to be written clearly “bpchar” data type。
thanks a lot！