Unsigned integer type with 10 digits can potentially contain values

which don't fit signed integer type. Regard such columns as Bignum,
so that bigint type will be used in target database.

lib/sequel/extensions/schema_dumper.rb

@@ -149,8 +149,14 @@ def column_schema_to_generator_opts(name, schema, options)
     # database type is not recognized, return it as a String type.
     def column_schema_to_ruby_type(schema)
       case t = schema[:db_type].downcase
-      when /\A(?:medium|small)?int(?:eger)?(?:\((?:\d+)\))?(?: unsigned)?\z/o
-        {:type=>Integer}
+      when /\A(medium|small)?int(?:eger)?(?:\((\d+)\))?( unsigned)?\z/o
+        if !$1 && $2 && $2.to_i >= 10 && $3
+          # Unsigned integer type with 10 digits can potentially contain values which
+          # don't fit signed integer type, so use bigint type in target database.
+          {:type=>Bignum}
+        else
+          {:type=>Integer}
+        end
       when /\Atinyint(?:\((\d+)\))?(?: unsigned)?\z/o
         {:type =>schema[:type] == :boolean ? TrueClass : Integer}
       when /\Abigint(?:\((?:\d+)\))?(?: unsigned)?\z/o