The Most Exciting Elixir 1.6 Feature is

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1

from my POV (just upgraded) it’s defguard - anything to help me write more sensible, stricter guards… Sorely needed.

https://hexdocs.pm/elixir/Kernel.html#defguard/1

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2

I really relly loved mix format

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3

me too - although I will miss my use of a lispy style syntax

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