LibCrypto: Improve Crypto::BigFraction::to_double
Our current implementation is admittedly naive:
ladybird/Libraries/LibCrypto/BigFraction/BigFraction.cpp
Lines 137 to 141 in 93712b2
We use BigFraction in a couple places in our Temporal implementation, and this implementation is the last thing preventing us from passing 100% of (non-Intl) Temporal tests:
❌ test/built-ins/Temporal/Duration/prototype/round/precision-exact-in-round-duration.js
❌ test/built-ins/Temporal/Duration/prototype/total/precision-exact-mathematical-values-1.js
❌ test/built-ins/Temporal/Duration/prototype/total/precision-exact-mathematical-values-2.js
❌ test/built-ins/Temporal/Duration/prototype/total/precision-exact-mathematical-values-6.js
❌ test/built-ins/Temporal/Duration/prototype/total/precision-exact-mathematical-values-7.js
❌ test/built-ins/Temporal/Duration/prototype/total/total-of-each-unit-relativeto.js
(Alternatively, maybe we don't want to be in the business of maintaining BigInt implementations, and use something like mpfr instead)
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