Not a R6RS fan myself, so no definitive answer. But AFAIK Chez (now open source ... | Hacker News

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kkylin on Nov 28, 2018 | parent | context | favorite | on: Perchance to Scheme (2016)

Not a R6RS fan myself, so no definitive answer. But AFAIK Chez (now open source as someone else posted) is R6RS-compliant and one of the fastest implementations. Also, R7RS-small is final I think. Not sure about R7RS-large. Here's an old discsussion: https://news.ycombinator.com/item?id=11700167.

ballpark on Nov 28, 2018 [–]

I think Chicken Scheme recently became r7rs in their new version 5

Globz on Nov 28, 2018 | [–]

Chicken R7RS is still a work in progress AFAIK

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