at this 
method(https://github.com/rails/rails/blob/08754f12e65a9ec79633a605e986d0f1ffa4b251/activerecord/lib/active_record/schema_migration.rb#L24)

limit is default to `nil` which mean it is optional argument, and few lines 
down `version_options` only adds limit when the limit is passed from the 
argument.

and in this 
method(https://github.com/rails/rails/blob/08754f12e65a9ec79633a605e986d0f1ffa4b251/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb#L241)
 
pass on the options to `new_column_definition `, and this 
`new_column_definition` 
method(https://github.com/rails/rails/blob/08754f12e65a9ec79633a605e986d0f1ffa4b251/activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb#L295)
 
will try to `fetch(:limit)` which will raise exception.

Am wondering had I missing something ?

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