It would be great if I could map existing files into MemFs virtual file system for reading:
MemFs.map("my_file", "my_other_file") # Map file "my_file", "my_other_file"
MemFs.map("my_files_directory") # Map directory "my_file_directory"
MemFs.map("my_files_directory" => "my_virtual_directory") # Map directory "my_file_directory" to "my_virtual_directory"