Directory name clashes on case-insensitive filesystem

[LewisGaul]

When cloning this repo on a Windows-based OS (WSL1 in my case) there is a warning about path collisions due to the case-insensitive filesystem.

$git clone https://github.com/kenkundert/nestedtext_tests
Cloning into 'nestedtext_tests'...
remote: Enumerating objects: 371, done.
remote: Counting objects: 100% (371/371), done.
remote: Compressing objects: 100% (251/251), done.
remote: Total 371 (delta 63), reused 365 (delta 59), pack-reused 0
Receiving objects: 100% (371/371), 45.66 KiB | 640.00 KiB/s, done.
Resolving deltas: 100% (63/63), done.
warning: the following paths have collided (e.g. case-sensitive paths
on a case-insensitive filesystem) and only one from the same
colliding group is in the working tree:

  'templates/lD/dump_in.json'
  'templates/ld/dump_in.json'
  'templates/lD/dump_out.nt'
  'templates/ld/dump_out.nt'
  'templates/lD/load_in.nt'
  'templates/ld/load_in.nt'
  'templates/lD/load_out.json'
  'templates/ld/load_out.json'

[kalekundert]

Good catch, thanks for the bug report!