We do not have an actual char type, it is merely the textual representation of the int8_t type.

If you for example wanted to propagate the character constant display type to all constants of type char (alias of int8_t) you would unknowingly make all non-char int8_t constants that display type.

>>> bv.parse_type_string("int8_t")
(<type: immutable:IntegerTypeClass 'char'>, '')