This reverts commit 9d5baf7d1d14ca7eb0852b41566330259229d489.
Benoît Viguier has proofs that values will stay well within 2^53. We
also have an improved carry function that's much simpler.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
We also reduce the optimization level, just in case, but add closure
compiler into the mix.
Suggested-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>