Create a table with TEXT column type.
generateChangeLog and push to new schema
diffChangeLog on the two.
The only change will be to change the column to CLOB.
There's a second bug (CORE-1592) regarding this that may make this a moot point. But it does seem add that the changeset generated from diffChangeLog does modifyDataType to TEXT or LONGTEXT, but to CLOB.
Linux and MySQL
Working for me. Probably fixed by earlier 3.0.8 issues
This is still an issue in 3.5.4 and 3.5.5