Allow deserialization of very large integers #75
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…building a System.String of the number substring. Reworked the integer parsing path in SimpleJson.cs to try decimal and double parsers if long fails. This allows numbers such as long.MaxValue + 1M to be parsed (yielding a decimal instead of a long). Numbers too large for System.Decimal become System.Double (at, of course, a loss of precision). Added tests GivenNumberWithoutDecimalTooLargeForLongTypeIsDecimal and GivenNumberWithoutDecimalTooLargeForDecimalTypeIsDouble to JsonDecodeTypeTests.cs.
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While I was working on a PR for RestSharp, I was reading through the SimpleJson code and discovered that the way in which it parses integers might reject some syntactically-valid JSON documents. In particular, JSON allows for very large integer values to be specified (values large enough that a 64-bit integer cannot represent them) with no punctuation or exponentiation. These values would, in typical implementations, need to be represented as floating-point values (
double), but because they lack periods andesignifiers, the SimpleJson code will only attempt to parse them aslong. This means that the (valid) JSON string produced by(long.MaxValue + 1M).ToString()cannot be parsed. This PR addresses the issue (usingdecimaland thendoubleas fallbacks wherelongfails), and adds corresponding unit tests.