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Re:Show HN: Xtypejs – Efficient data-validating pseudo types... by ie on Wednesday April 29, 2015 @08:02PM (#9462631)
This looks incredibly useful and I appreciate the focus on performance. I often avoid writing helpers for type checking edge cases due to performance concerns, but you've done the hard work for me. Thank you.
Re:Show HN: Xtypejs – Efficient data-validating pseudo types... by lucono on Thursday April 30, 2015 @12:19AM (#9463332)
Thanks. I developed and used it as a utility in a bigger library that worked heavily with types, but later exported it to its own project so I could share it, after I realized how useful it was, even stand-alone.

It is very highly optimized, as performance was of critical importance.