function _isNumeric (iValue) {
		// see sap/ui/thirdparty/jquery-compat for implementation details
		return (typeof iValue === "number" || typeof iValue === "string" ) && !isNaN(iValue - parseFloat(iValue));
	}
Inspects the oOptions.inputToValidate object in depth to find all errors
@param {object} oOptions validator options
@param {array} aErrors an array containing the result
@param {string} sPropertyPath full property path
@returns {array} an array of all the errors
@private