rails/rails — pull request #15285 by sergey-alekseev (2014-05-23 20:44:56+00:00)
Title: Remove duplicated parameter check on #where!

It seems that #where! is not designed to be used as a chained where.
See initial implementation at 8c2c60511beaad05a218e73c4918ab89fb1804f0.
So, no need to check twice.