Add TAU constant about proposal-math-extensions HOT 9 OPEN

I tried to propose this a few years ago, but it was rejected :(

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+1 link for TAU

Tau replaces Pi - Numberphile:
https://www.youtube.com/watch?v=83ofi_L6eAo

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FWIW, I agree with you and the rationale

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Well, Python got it now. Maybe that would convince some people.

Anyhow, I kinda agree that it's somewhat gimmicky, but on the other hand I always think it's silly that I have to define it myself. It's the math constant I use most frequently.

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I made nearly the same argument. The "Python has it" point might be compelling

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you could always const {PI, TAU=2*PI} = Math; in the files that need it, but I don't find it useful to add it in Math

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+1 for Tau. I'll call it that from now on instead of TWO_PI ;)

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The last time Math.TAU was rejected because

"one letter shorter, not well known, not well taught. PI is known, taught and ubiquitous."

(See meeting notes https://esdiscuss.org/notes/2014-07-31)

I don't see how any of this has changed.
And as Brendan wrote:

Don't rehash. New insights (they had better be new and good) in new thread.

(See https://mail.mozilla.org/pipermail/es-discuss/2014-August/038635.html)

And as there are no new and good insight, I doubt, that this will be accepted.

Let us focus on more important additions to the Math object.

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FWIW, CSS has an angular unit turn that effectively is τ and the CSS folks are reluctant to add any other way to use π. w3c/csswg-drafts#309

This means, you should reconsider whether rad↔deg is really all that should be added, and whether the conversion functions make sense as proposed when considering more than two angular units.

Math.RAD_PER_TURN would be 2*Math.PI, i. e. τ.

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