Add `unsigned` support for numeric data types in MySQL

Example:

    create_table :foos do |t|
      t.integer :unsigned_integer, unsigned: true
      t.bigint  :unsigned_bigint,  unsigned: true
      t.float   :unsigned_float,   unsigned: true
      t.decimal :unsigned_decimal, unsigned: true, precision: 10, scale: 2
    end

1 files changed, 2 insertions, 1 deletions

diff --git a/activerecord/test/cases/primary_keys_test.rb b/activerecord/test/cases/primary_keys_test.rb
index 0745a37ee9..58f3dd2ac2 100644
--- a/activerecord/test/cases/primary_keys_test.rb
+++ b/activerecord/test/cases/primary_keys_test.rb
@@ -300,11 +300,12 @@ if current_adapter?(:PostgreSQLAdapter, :MysqlAdapter, :Mysql2Adapter)
 
     if current_adapter?(:MysqlAdapter, :Mysql2Adapter)
       test "primary key column type with options" do
-        @connection.create_table(:widgets, id: :primary_key, limit: 8, force: true)
+        @connection.create_table(:widgets, id: :primary_key, limit: 8, unsigned: true, force: true)
         column = @connection.columns(:widgets).find { |c| c.name == 'id' }
         assert column.auto_increment?
         assert_equal :integer, column.type
         assert_equal 8, column.limit
+        assert column.unsigned?
       end
     end
   end