Replace with next value (ctrl shift dot) in Visual Studio Code

If I press the shortcut after highlighting an integer or float literal (16 or 5.2 for example) it subtracts 1 from it.

Strangely, Replace with Previous Value adds 1 to the value while Replace with Next Value subtracts 1.

I don't know if it has any other purpose.

Add to the accepted answer:

1. If you use it on a boolean, it toggles between true and false.
2. No need to "highlight" the number, putting the cursor on it is enough.

As noted by @Félix Caron, this is how to swap the two keys.

keybindings.json

{ "key": "ctrl+shift+oem_period", "command": "editor.action.inPlaceReplace.up",   "when": "editorTextFocus && !editorReadonly" },
{ "key": "ctrl+shift+oem_comma",  "command": "editor.action.inPlaceReplace.down", "when": "editorTextFocus && !editorReadonly" },

Moreover, in my case as I have breadcrumbs enabled "breadcrumbs.enabled": true,, the replaceUp key triggered breadcrumbs instead, so I had to unbind it.

{ "key": "ctrl+shift+oem_period", "command": "-breadcrumbs.toggleToOn",           "when": "!config.breadcrumbs.enabled" },
{ "key": "ctrl+shift+oem_period", "command": "-breadcrumbs.focusAndSelect",       "when": "breadcrumbsPossible" },