Already on master: https://github.com/rails/rails/pull/21069.

Reported in This Week in Rails here: 
https://rails-weekly.ongoodbits.com/2015/09/11/performance-mysql-prepared-statements-and-more
 ;)

> Den 29. sep. 2015 kl. 20.17 skrev Nam Chu Hoai <namb...@googlemail.com>:
> 
> Hey all,
> 
> Validations are a relatively obscure and not particularly well documented 
> feature that do come in handy when using particularly complex models with 
> complex lifecycles and states. Ideally, I'd use Concerns to dynamically add 
> validations but that hasn't been proven fruitful. I was wondering what you 
> guys and gals think of extending validation contexts to be an array, so that 
> one could pass in multiple contexts?
> 
> Nam
> 
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Kasper

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