lookupWord8AsInt# addr index looks up for the index-th 8-bits word in the bitmap starting at addr, then convert it to an Int.

The caller must make sure that:

• ceiling (addr + (n * 8)) is legally accessible Word8#.

Since: 0.3.0

nextInt8# addr looks up for the 8-bits word in the bitmap starting at addr, then convert it to an Int#.

Since: 0.3.0

nextInt32# addr looks up for the 32-bits word in the bitmap starting at addr, then convert it to an Int#.

Since: 0.3.0