Feature Detection Is Better than Version Detection

Summary: Version Detection like checking $BASH_VERSION or User-Agent == "Mozilla" is bad for portability.

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• Comment on Hacker News Thread: Bash Completion in JSON Fields
  • All browsers pretend they're Mozilla
• LLVM Has to Pretend It's GCC

NOTE: OSH won't pretend it's bash! It is largely compatible with bash, but not identical.