For the record, SA = Static Analysis, which is what apparently LSP is all about. Thanks for the comments!
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RT @bbatsov
@borkdude @Endless_WebDev I never thought that they are mutually exclusive, but I know that some people think differently. Of course, the perspective of people if often tied to their personal background the habits that came with it. I agree that combining a REPL with SA can yield great results.
https://twitter.com/bbatsov/status/1452965524573507593