On Thu, Jun 7, 2018 at 10:38 PM Stephen J. Turnbull <turnbull.stephen.fw@u.tsukuba.ac.jp> wrote:

6.123233995736766e-17
>>>

is good enough for government work, including at the local public high
school.


There probably is room for a library like "fractions" that represents multiples of pi or degrees precisely. I'm not sure how complicated or valuable of an endeavor that would be. But while I agree that floating point is good enough, we probably can do better.