4d-324 signals a reader error but shouldn't?
|Reported by:||rtoy||Owned by:||somebody|
At the repl, 4d-324 throws a reader error. But the nearest float to 4d-324 is least-positive-double-float so we should probably return that instead of throwing an error.
But values less than 0.5 * least-positive-double-float could be rounded to 0, but I think the reader error is still appropriate. CLHS 18.104.22.168 says exponents that are out of range should signal a reader error.