json-xml-rpc javascript client produces invalid XML request

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What steps will reproduce the problem?
1. Connect to an XML-RPC service

var service= new rpc.ServiceProxy("/local/service/", {asynchronous:false, 
protocol: 'XML-RPC', methods: ['add_float']});

2. Call a function that takes float values as input and provide a negative float

var pt = service.add_float(-111.1111, 56.1111);

What is the expected output? What do you see instead?

The formed XML request will be invalid when a negative float is given. It will 
be incorrectly advertised as an int type causing an error on most XML-RPC 
servers.

What version of the product are you using? On what operating system?

- rpc-client-javascript-0.8.0.2
- firefox 3.6.13

Please provide any additional information below.

The problem seems to be on line 669 where the library is discovering the type 
of the input. It uses "if(parseInt(value) == Math.ceil(value))" which will only 
work for positive floats. A function something like the following could be used 
instead.

function isFloat(num)
{
    ret = num%Math.floor(num);

    if(ret == 0 || isNaN(ret) == true)
    {
        return false;
    }
    else
    {
        return true;
    }
}

Original issue reported on code.google.com by angus.di...@gmail.com on 11 Feb 2011 at 5:42