Sort by file extension in netrw?

Is it possible to sort by file extension in netrw?

I cycled the sort sequence with 's' in my netrw tree and was surprised to see "by extension" is not in the various sort methods. Only name, time, and size.

I looked in the help found the g:netrw_sort_sequence but that just looks like a way to pull out specific file patterns and put them at the top. I did eventually accomplish the task I was trying to do using this option (actually using the 'S' mapping), by pulling the one set of files I wanted to the top, but I wonder in general if I can easily group all files by extension.

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