Cautious conversion of data- attributes to numbers by jQuery.fn.data

cautiousData.js

// limit .data number parsing to canonical representations
// fixes jQuery tickets #7579; #11297; #10174
(function( $ ) {

var fnData = $.fn.data;

$.fn.data = function( key, value ) {
    if ( value === undefined ) {
        // parse data attributes on every element (including forms with unfortunately-named controls)
        // before the official jQuery.fn.data gets a chance to
        this.each(function() {
            var attributes, idx, attrName, attrKey, attrValue,
                data = $.data( this );

            // make sure this is an element that hasn't been previously processed
            if ( ( this.nodeType === 1 || this.nodeType && this.nodeType.nodeType === 1 ) &&
                !data["fix #7579; #11297; #10174"] ) {

                // deal with all data- attributes
                attributes = this.attributes;
                for ( idx = attributes.length - 1; idx >= 0; idx-- ) {
                    attrName = attributes[ idx ].name;
                    if ( (attrKey = /^data-(.*)/.exec( attrName )) != null ) {
                        attrKey = $.camelCase( attrKey[1] );
                        
                        // set the data for this key unless it already exists (cf. dataAttr)
                        if ( data[ attrKey ] === undefined ) {
                            attrValue = attributes[ idx ].value;

                            try {
                                attrValue = attrValue === "true" ? true :
                                    attrValue === "false" ? false :
                                    attrValue === "null" ? null :
                                    // here's the change
                                    $.isNumeric( attrValue ) && +attrValue + "" === attrValue ? +attrValue :
                                    /^(?:\{.*\}|\[.*\])$/.test( attrValue ) ? $.parseJSON( attrValue ) :
                                    attrValue;
                            } catch( e ) {}

                            // storing the data
                            $.data( this, attrKey, attrValue );
                        }
                    }
                }

                // flag to skip parsing on the next .data request
                $.data( this, "fix #7579; #11297; #10174", true );
            }
        });
    }
    
    // now defer to the original .data
    return fnData.apply( this, arguments );
};

})( jQuery );