Mark Dickinson added the comment:

> Oddly, with all of the strictness in JSON, the exponent-marker "e"
> can be upper- or lower-case

I'd guess that the aim is that common floating-point output formats from a 
variety of languages are valid JSON.  That would also explain why both '+' and 
'-' are allowed on the exponent, but only '-' on the significand, and why 
leading zeros are permitted on the exponent but not the significand.

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<http://bugs.python.org/issue19871>
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