Refactors in a large dynamic code base are only small if the API you're refactoring has a small footprint in usage. Others have already given reasons why: tests

Refactors in a large dynamic code base are only small if the API you're refactoring has a small footprint in usage. Others have already given reasons why: tests will break, runtime issues will crop up, etc. The lack of static typing can really hinder refactoring of any size--even of "internal only" code if metaprogramming has been employed.