Allow leading zero with exponents; e.g., "0e1".

[jgallagher]

Fixes one of the two issues brought up in #198.

[jeremy-w]

Maybe check with negative exponent and zero exponent, as well?

[jeremy-w]

Also toss in one with uppercase E to check we handle that variant spelling.

[jeremy-w]

And maybe more fun with leading zeroes, too, like 0001E0001 for 10.

[jgallagher]

👍 on neg/zero exponent and uppercase E. Leading zeros are not allowed in JSON, and we already have a unit test to confirm they're rejected.

[jeremy-w]

Looks like a leading zero is admitted for the exponent, though. The number production uses int restricted to be zero or non-zero and then whatever digits, but exp is just "at least one digit" in its numeric part, so leading zeroes are legit there.

      number = [ minus ] int [ frac ] [ exp ]

      decimal-point = %x2E       ; .

      digit1-9 = %x31-39         ; 1-9

      e = %x65 / %x45            ; e E

      exp = e [ minus / plus ] 1*DIGIT

      frac = decimal-point 1*DIGIT

      int = zero / ( digit1-9 *DIGIT )

      minus = %x2D               ; -

      plus = %x2B                ; +

      zero = %x30                ; 0

https://tools.ietf.org/html/rfc7159 section 6 (page 6)

[jgallagher]

👍 711f3a7

[jeremy-w]

👍 LGTM