Rails 4 gem size [closed]

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Curious why gem 'rails' started to be more than 1 MB from version 4.0.

See the difference:
4.0.0.beta1 February 26, 2013 (1.49 MB)
3.2.17 February 18, 2014 (3.5 KB)

EDIT: As Chris Gunther found in commit history and wrote below "Commit 6d87cd02 moved the guides from the railties gem to the rails gem."

Answer 1

Commit 6d87cd02 moved the guides from the railties gem to the rails gem. While the rails gem went up in size, the railties gem when down in size:

rails 4.0.0.beta1    1.49 MB
rails 3.2.17         3.5 KB

railties 4.0.0.beta1 110 KB
railties 3.2.17      1.52 MB

https://rubygems.org/gems/railties/versions