Symfony version(s) affected: 4.3.5

Description
Console commands that register their namespace as a number will be renumbered by an array_merge() operation, such that if there is only one numeric namespace, it will always be renumbered to 0. This is visible when the list command emits text output.

How to reproduce

1. Add a Console command with a numeric namespace.
2. Run bin/console.

Possible Solution
In ApplicationDescription, line 134 should be $namespacedCommands = $globalCommands + $namespacedCommands; because avoiding the array_merge() prevents the renumbering.