Added code to parse when JSON response has a numeric value in it

[jayarajumetta]

No description provided.

[erendrake]

It would be great to be able to support all of the RFC7159 document types

https://datatracker.ietf.org/doc/html/rfc7159#section-3

3. Values

A JSON value MUST be an object, array, number, or string, or one of
the following three literal names:

  false null true

The literal names MUST be lowercase. No other literal names are
allowed.

  value = false / null / true / object / array / number / string

  false = %x66.61.6c.73.65   ; false

  null  = %x6e.75.6c.6c      ; null

  true  = %x74.72.75.65      ; true