Old usage is still accepted but causes a deprecation warning, saying
we will remove it in v0.21. Similar to #2300. I am planning to add
an option to do wasm compilation in a subsequent PR.

I also did some cleanup from #2300 and added tests for the deprecation 
warnings.
Change extract_dir argument of unpackArchive to be a keyword argument. Old usage is still accepted but causes a deprecation warning, saying
we will remove it in v0.21. Similar to #2300. I am planning to add
an option to do wasm compilation in a subsequent PR.

I also did some cleanup from #2300 and added tests for the deprecation 
warnings.
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