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Implementations of the From trait for converting a primitive float to a Rational.

from

use malachite_q::Rational;

assert_eq!(Rational::from(0.0), 0);
assert_eq!(Rational::from(1.5).to_string(), "3/2");
assert_eq!(Rational::from(-1.5).to_string(), "-3/2");
assert_eq!(Rational::from(0.1f32).to_string(), "13421773/134217728");