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Can Matlab packages have subdirectories?

I'd like to organize my Matlab packages into folders. However, if I try to lay out my code like this

```none
+MyPackage
   |---foo.m
   |---SubDir
          |---bar.m
```

then I'm unable to reach bar. For example, if the contents of foo.m are

```matlab
function foo
disp("foo")
bar
end
```

and the contents of bar.m are

```matlab
function bar
disp("bar")
end
```

then running `MyPackage.foo` outputs

```none
foo
Error using bar
Not enough input arguments.
Error in MyPackage.foo (line 3)
bar
```

Trying to add SubDir with `addpath` gives a warning that package directories are not allowed in the MATLAB path. Does everything in a Matlab package really need to be within a single directory, or is there a way to organize packages with subdirectories?