change BitBool.T# to Int8#?

[chessai]

upcasting to Int# should be a no-op for things like eg. isTrue#
but Int8# should take up less space

is there a good argument against this?

[chessai]

i also noticed that some of the exported functions do not use the type synonym T# but rather Int#.

[chessai]

i also noticed that some of the exported functions do not use the type synonym T# but rather Int#.

actually, i noticed this inconsistency in multiple modules.