It's turned Aprilly to-day — sharp showers and sunshine.

That is, the lower nibble (the 4 bits 1010 = A) has been masked to zero. This is because ANDing anything with a zero produces a zero, while ANDing any bit with a 1 leaves the bit unchanged […]

...she was sworn just as she was, all rags and tatters.

His lack of conversation is attributable to his shyness.