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revises the documentation of ActiveRecord::Relation#find_or_create_by…
… [ci skip] * Inspect uses double quotes. * Inspect puts a hash as in #<User ...>. * Documents the return value, and makes explicit it can be an invalid record. * Documents the method is not atomic. * Documents a way to handle UNIQUE contraint violations in the event of a race condition. * Removes the "Examples" header according to our guidelines.
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