I was talking with @sgrif about this in this 
ticket https://github.com/rails/rails/issues/19570.

I think the current validates_length_of is pretty fine expressing thinks 
like "the username is too long", and the tokenizer is ideal for strings 
situations but when it comes to arrays, collections, etc is really strange 
to override the message error and not being able to use some kind of 
selector.

I did this gist to test this out 
https://gist.github.com/mmontossi/984f8ebfd50ea843b5f2

I was using this validator to thinks like:

validates_count_of :photos, within: 1..3, selector: ->(photos) { 
photos.reject(&:marked_for_destruction?) }

This allows to have new errors.messages keys to express quantity:

errors.messages.too_many
errors.messages.too_few
errors.messages.wrong_count

Anyone shares this point of view?

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