John J. Aylward 2f2cd4dfc5 Fix for number output bug. ...

java.lang.Number is currently output without any validation. For all java.* Numbers, this is fine, but for custom Number implementations like Complex or Fraction, the resulting JSON output may be invalid.

For example: If a Fraction implementation defines its' toString method as `return numerator + "/" + denominator`, then the resulting JSON output would be something like this:

```json
{ "fraction" : 1/2 }
```

This is not valid JSON.

This commit verifies that the string representation of the number is close to a JSON formatted number by use of the BigDecimal constructor. If the constructor throws a NumberFormatException, then the string value is instead quoted as a string. The example above would instead output like the following:

```json
{ "fraction" : "1/2" }
```

2016-08-17 12:54:30 -04:00

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