Format code: guides?

Where is the rules for the “Format code” located? Juno is split among many github repos and I’m not sure which one this function resides in. I want to study it as some good code formatting guidelines. One thing I noticed is that it will change e.g.
a = [sin(i) for i in 0:0.1:10]
to
a = [sin(i) for i = 0:0.1:10]
Is there a reason for preferring = over in? (2 key-stroke instead of 1?) Thanks!

Personally, I prefer in as it makes more semantic sense.

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This discussion/issue on github provides some reasons for preferring = vs in and vice-versa

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