Migrating an application from prototype 1.5 to 1.7

I am migrating an application from prototype 1.5 to prototype 1.7.

Has anyone already had an experience with this migration?

Please sha开发者_如何转开发re the pain points that I may face while doing this migration.

Thanks,

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I completed the upgradation everything worked fine. http://www.prototypejs.org/learn/upgrading This feature is really helpful.