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ff3bf98345
Found while fuzzing. Previously 1.1897314953572317650857593266280070162E4932 was parsed as +inf, which caused issues for round-trip serialization of floats. Only f128 had issues, but have added other tests for all floating point large normals. The max_exponent for f128 was wrong, it is subtly different in the decimal code-path as it is based on where the decimal digit should go. This needs to be 2 greater than the max exponent (e.g. 308 or 4932) to work correctly (greater by 1, then we use a >= comparision). In addition, I've removed the redundant `optimize` constant which was only use for testing the slow path locally.