I would prefer re-wording this line as:

Rails 3.2 - 4.0 also requires an initializer to properly cast the prepared_statements configuration string as a boolean. This initializer is adapted from [this commit](https://github.com/rails/rails/commit/e54acf1308e2e4df047bf90798208e03e1370098). In file `config/initializers/database_connection.rb` insert the following: