Can't enable namespace disabled by notThis

[bato3]

Usecase:

set DEBUG=knex:query && node file.js

const DebugModule = require('debug')

//temporary disable logging 
let x = DebugModule.disable()
DebugModule.enable(x+ ',-knex:query');  // almost OK: knex:query,-knex:query

//and try re-enable
x = DebugModule.disable()
DebugModule.enable(x+ ',knex:query') // Don't work: knex:query,knex:query,-knex:query

I think that namespaces with identic name should be filtered before adding. (eg knex:*,-knex:*, not knex:query,-knex:*)

This is needed for temporary blocking and unlock namespaces eg by REST API.

[Qix-]

This is a known issue and is listed to be fixed via #425.

Going to close as a duplicate.