Again, I haven't seen robust evidence either way about development speed, and any such anecdata will have an equivalent from the other side. One clear failure

Again, I haven't seen robust evidence either way about development speed, and any such anecdata will have an equivalent from the other side. One clear failure of dynamic types for Web programming is injection attacks, which are trivially solved by treating HTML, SQL, etc. as separate types (e.g. http://blog.moertel.com/posts/2006-10-18-a-type-based-solution-to-the-strings-problem.html http://blog.moertel.com/posts/2006-10-18-a-type-based-soluti... )