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From some googling, I'm guessing jonathonf means https://www.propellerheads.se/en/reason a commercial music and audio editing package.

Not https://www.reasonco.com/ that appears to sell hardware.

or other 'reason' initiatives.

That was my assumption from the title haha. Reason releasing old source code or something.

I only know of ReasonML, what Reason are you referring to?

It comes down to domain knowledge. I am a musician, and whenever anyone mentions 'Reason', I instantly think of the DAW software by that name.

I have been a programmer for as long as I have been a musician, but strangely, never heard of ReasonML until now!

ReasonML is fairly new but I believe Facebook has big plans for it, so we’re likely going to hear a lot more about it in the coming months.