Someone opened an issue on sinatra-assetpack recently regarding unexpected behaviour of our Dir#glob-like feature to match source files in a given assets package.
I found out that File#fnmatch? method we use to reproduce a glob-like matching on assets soruces is not behaving exactly the same way a Dir#glob would under certain conditions.
There was a very tiny hint in the documentation :
The pattern is not a regular expression; instead it follows rules similar to shell filename globbing.
Specifically in this case,
fnmatch? will not match starting
But you can specify an option flag to enable matching of those cases (likely what you expect in most cases) :
File.fnmatch?(expected, filename, File::FNM_PATHNAME | File::FNM_DOTMATCH)