namespaces returned by debug.disable are not always accepted by debug.enable

Start in common.js at the enable implementation around line 184 and reproduce the issue with DEBUG=":error:". Trace how debug.disable() transforms the namespace before it is passed back to debug.enable(). Done means the namespace returned by disable() can be passed to enable() without an invalid regular expression error.

I have seen some strange behavior when temporary disabling the current namespaces, and trying to re-enable the namespaces returned by the debug.disable() call later in the debug.enable() call.
This happened while debugging a node-red custom node that I'm working on:

First I start node-red with some logging enabled:
DEBUG="*:error:*" node-red
Then using a REST call i fetch the current namespaces as follows:

    RED.httpAdmin.get('/debug', function (req, res) {
        console.log("/debug",req.method);
        var namespaces = debug.disable();
        console.log("/debug",req.method,namespaces);
        debug.enable(namespaces);
        res.end(JSON.stringify(Object({ "namespaces": namespaces })));
    });

When this function is called, it prints the following on the console:

/debug GET
/debug GET .*?:error:*
SyntaxError: Invalid regular expression: /^..*??:error:.*?$/: Nothing to repeat
    at new RegExp (<anonymous>)
    at Function.enable (/home/hurenkam/Workspace/node-red-contrib-mh-hue/node_modules/debug/src/common.js:184:28)
    at /home/hurenkam/Workspace/node-red-contrib-mh-hue/src/debug.js:21:15
    at Layer.handle [as handle_request] (/usr/local/lib/node_modules/node-red/node_modules/express/lib/router/layer.js:95:5)
    at next (/usr/local/lib/node_modules/node-red/node_modules/express/lib/router/route.js:144:13)
    at Route.dispatch (/usr/local/lib/node_modules/node-red/node_modules/express/lib/router/route.js:114:3)
    at Layer.handle [as handle_request] (/usr/local/lib/node_modules/node-red/node_modules/express/lib/router/layer.js:95:5)
    at /usr/local/lib/node_modules/node-red/node_modules/express/lib/router/index.js:284:15
    at Function.process_params (/usr/local/lib/node_modules/node-red/node_modules/express/lib/router/index.js:346:12)
    at next (/usr/local/lib/node_modules/node-red/node_modules/express/lib/router/index.js:280:10)

It would seem that the wildcard namespace "*:error:*" is being translated to ".*?:error:*" which when fed back into debug.enable() triggers an error in common.js @ line 184 when trying to push the expression into a RegExp:

common.js:
184: createDebug.names.push(new RegExp('^' + namespaces + '$'));