`smpt.gmail.com` should be `smtp.gmail.com`

remove association reload option from guide [ci skip]

The option was deprecated in 6eae366d

Add `unsigned` support for numeric data types in MySQL

Move `explain` into `AbstractMysqlAdapter`

Fix undesired type lookup with `SET` in MySQL

Eliminate the duplication code of `visit_TableDefinition`

Do not dump a view as a table in sqlite3, mysql and mysql2 adapters

Remove unnecessary display width

Eliminate the duplicated `options_include_default?` method

Reduce the calling `create_table_info` query

Should test both mysql adapters

Added test for `send_file_headers` called with nil content type

Run Beanstalkd integration tests in ActiveJob

Correctly dump composite primary key

String#strip_heredocs doesn't need Object#try anymore

Call to Object#try was removed with this pull request https://github.com/rails/rails/pull/21596

Example:

    create_table :barcodes, primary_key: ["region", "code"] do |t|
      t.string :region
      t.integer :code
    end

Some test cases are testing only mysql adapter. We should test mysql2
adapter also.

Remove `@connection` in `StatementPool`

`@connection` in `StatementPool` is only used for PG adapter.
No need for abstract `StatementPool` class.

Replaced `ThreadSafe::Map` with successor `Concurrent::Map`.

Correcting `NameError` error message in `mattr_reader` method. [ci skip]

Corrected numeric conversions output [ci skip]

The thread_safe gem is being deprecated and all its code has been merged
into the concurrent-ruby gem. The new class, Concurrent::Map, is exactly
the same as its predecessor except for fixes to two bugs discovered
during the merge.

Replace `#=>` with `# =>` [ci skip]

change test method name to the appropriate name

@rafaelfranca suggested in https://github.com/rails/rails/commit/f7c7bcd9c2a8b0e8c2840295d001d2d4dfd4cfae that code examples should display
the result after  `# =>` and not after `#=>`.

Fixed unclosed tags in kindle guide source [ci skip]

nodoc raw_write_attribute

Is this supposed to be public API? If so, I can document it instead.
📝

This can still be added to the middleware stack, but is really not
necessary.  I'll follow up with a commit that deprecates the constant

* pp:
  remove outdated comment
  all parameter parsing is done through the request object now.
  let the request object handle parsing XML posts
  remove setting request parameters for JSON requests
  remove the request parameter from `parse_formatted_parameters`
  do not instantiate a param parser middleware
  push the parameter parsers on to the class
  stop eagerly parsing parameters
  only wrap the strategy with exception handling
  pull `normalize_encode_params` up
  remove the `default` parameter from the parser method
  move parameter parsing to the request object