e6ecc93a17
Commit e09996ff8dee3f70 was one brick shy of a load: it didn't insist that the detected JSON number be the whole of the supplied string. This allowed inputs such as "2016-01-01" to be misdetected as valid JSON numbers. Per bug #13906 from Dmitry Ryabov. In passing, be more wary of zero-length input (I'm not sure this can happen given current callers, but better safe than sorry), and do some minor cosmetic cleanup.
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