tag helper always return a html safe string and concat two html safe
strings always return a html safe string

it is array of symbols now

This support is near-identical to the existing submit_tag support.

Example:

    <%= form_for @post do |f| %>
      <%= f.button %>
    <% end %>

You can provide a namespace for your form to ensure uniqueness of id attributes on form elements.
The namespace attribute will be prefixed with underscore on the generate HTML id

f.number_field generates <input type="number", size="30"../> which is
invalid HTML5. See: http://dev.w3.org/html5/spec/Overview.html#number-state

Deprecate ActiveModel::Name#partial_path. Now you
should call #to_path directly on ActiveModel
instances.

Deprecate ActiveModel::Name#partial_path. Now you
should call #to_path directly on ActiveModel
instances.

oh and obviously I meant according to Webster, not Weber

American English(according to Weber)

Change d3cfee11 removed the automatically generated object_name_submit id attributes on form submit elements. This makes the documentation match.