refactor Function#once. A single-op memoize function is equal to throttling forever!
refactor Function#once. A single-op memoize function is equal to
throttling forever!


Former-commit-id: 22375fab2359ebe33169b9da6fc85abecd0cef4e [formerly c554fa1458e00aaaf7871d0846a3159589611252]
Former-commit-id: c91b38d2f84347146e980f32e1fe1955c4a12390
romancow/Sugar,andrewplummer/Sugar,romancow/Sugar,andrewplummer/Sugar