isfile_casesensitive: check if path in fail fast too

Author: IanButterworth

base/loading.jl

@@ -11,7 +11,8 @@ if Sys.isunix() && !Sys.isapple()
 elseif Sys.iswindows()
     # GetLongPathName Win32 function returns the case-preserved filename on NTFS.
     function isfile_casesensitive(path)
-        isaccessiblefile(path) || return false  # Fail fast
+        isaccessiblepath(path) || return false  # Fail fast. Not a path when case insensitive
+        isaccessiblefile(path) || return false  # Fail fast. Not a file when case insensitive
         basename(Filesystem.longpath(path)) == basename(path)
     end
 elseif Sys.isapple()