Martimer,

Mortimer Cladwell 写道：
> looks like the difference, other than make/git related files are 
> four empty
> directories doc, scripts, shinyln and tests, so appears empty 
> directories
> are not allowed?

They are allowed but they change the hash, just as any other 
difference would.

Missing or extraneous directories are no less meaningful than 
files or permissions, etc., and can easily cause the build to fail 
(‘cd: blah: No such file or directory’, ‘mkdir: cannot create foo: 
File exists’) or otherwise behave very differently.

Kind regards,

T G-R