strings are allowed as numbers

[davepacheco]

In places where a "number" is required, a "string" value is accepted. Moreover, numeric constraints like "minimum" are correctly applied to numeric values, but are ignored for string values. Here's a test program:

/*
 * test case for json-schema validation issue with strings as integers
 */
var assert = require('assert');
var jsonschema = require('json-schema');

var schema = {
    'type': 'integer',
    'minimum': 0
};

console.log('validate -1 as a positive integer (expect fail, got fail)');
console.log(jsonschema.validate(-1, schema));

console.log('validate 1 as a positive integer (expect okay, got okay)');
console.log(jsonschema.validate(1, schema));

console.log('FAIL: validate "-1" as a positive integer (expect fail, got okay)');
console.log(jsonschema.validate('-1', schema));

console.log('FAIL: validate "1" as a positive integer (expect fail, got okay)');
console.log(jsonschema.validate('1', schema));

and here's the output for my system:

dap@sharptooth jst $ uname -a
Darwin sharptooth.local 12.5.0 Darwin Kernel Version 12.5.0: Sun Sep 29 13:33:47 PDT 2013; root:xnu-2050.48.12~1/RELEASE_X86_64 x86_64
dap@sharptooth jst $ node -v
v0.10.18
dap@sharptooth jst $ npm ls 
/Users/dap/Desktop/jst
└── json-schema@0.2.2

dap@sharptooth jst $ node issue-int.js 
validate -1 as a positive integer (expect fail, got fail)
{ valid: false,
  errors: [ { property: '', message: 'must have a minimum value of 0' } ] }
validate 1 as a positive integer (expect okay, got okay)
{ valid: true, errors: [] }
FAIL: validate "-1" as a positive integer (expect fail, got okay)
{ valid: true, errors: [] }
FAIL: validate "1" as a positive integer (expect fail, got okay)
{ valid: true, errors: [] }