skipDirs is overriden by installExt

[ftsf]

# Package

version       = "0.4.3"
author        = "Jez 'Impbox' Kabanov"
description   = "Nico Game Engine"
license       = "MIT"

# Dependencies

requires "nim >= 1.4.0"
requires "sdl2_nim >= 2.0.14.2"
requires "gifenc >= 0.1.0"
requires "nimPNG >= 0.3.1"
requires "zippy >= 0.5.9"

skipDirs = @["examples","tests","android","tools"]
installExt = @["nim"] # removing this line causes check to pass

bin = @["nicoboot","nicoandroid","nicosynth"]

causes warning

nimble check
   Warning: Package 'nico' has an incorrect structure. It should contain a single directory hierarchy for source files, named 'nico', but file 'audio.nim' is in a directory named 'examples' instead. This will be an error in the future.
      Hint: If 'examples' contains source files for building 'nico', rename it to 'nico'. Otherwise, prevent its installation by adding `skipDirs = @["examples"]` to the .nimble file.

if installExt line is removed

nimble check
   Success: nico is valid!

using nimble v0.13.1 compiled at 2021-05-25 01:13:00

I would expect nim files in any of the skipDirs to be skipped despite installExt.