Hello,

Currently if you have a string column that have only number values (think a 
year column using string by mistake) and you want to change to integer, you 
can't.

If you apply this monkey-patch will be possible: 
https://gist.github.com/1393441


Note: if some value can't be casted by postgresql (if have a letter for 
example), the migration will fail as expected.

I think this is the expected behavior on change_column and I'm not sure but 
I guess mysql already does that.


What you think?

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