bigdec

(bigdec x)

Answers an integer itself, a double as the exact rational of the shortest decimal it prints as ((bigdec 0.1) is 1/10), a ratio only when its decimal expansion is finite ((bigdec 1/3) signals, like the oracle), or a decimal string ("1.5", "1e3") parsed. NaN, an infinity, nil and a character signal. There is no decimal type, so the result is a plain rational and prints as one (3/2, where the oracle prints 1.5M); (double (bigdec "1.5")) is 1.5. As a value a one-argument function.