I just noticed the following about SQLCustomType in the book: "This feature is marked as experimental. In practice is has been in web2py for long time and it works but it can make the code not portable, for example when the native type is database specific. It does not work on Google App Engine NoSQL."
Is this a new change? I'm using 1.98.2 and am using SQLCustomType on GAE NoSQL (and am about to add another custom field). Will this break on upgrade? or by chance is the book wrong? thanks, christian