Usage of .StackCount?

[MeRayORG]

I want to ask what the usage of stackcount is, because any usage that I could guess doesn't seem to be useful. At first I thought it was to get the total amount of folders from the home directory or the root, whichever applies. Then, maybe it's the current stackcount at each folder, but that also didn't work. And if you put it somewhere else in the template, it's just 0.

"properties": {
    "folder_icon": "{{.StackCount - 3}}",
    "folder_separator_icon": "\ue0b0",
    "style": "agnoster_short",
    "max_depth": 3,
    "folder_format": "{{.StackCount}}%s"
},
"template": "{{.StackCount}}{{ .Path }}",
"type": "path"

(irrelevant parts omitted)

[PGScully]

It's the size of the directory stack used by the pushd, popd and dirs shell builtins.