'clearb(addr, ndx = 0) -> int
Clears byte at ``((uint8_t*)addr)[ndx]`` from the cache and
returns the removed value or `None` if the address was not completely set.
Examples:
>>> l = MemLeak(lambda a: None)
>>> l.cache = {0:\'a\'}
>>> l.n(0,1) == \'a\'
True
>>> l.clearb(0) == unpack(\'a\', 8)
True
>>> l.cache
>>> l.clearb(0) is None
True'

def clearb(self, addr, ndx=0):

    return self._clear(addr, ndx, 1)
