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MySQL and PostgreSQL provide a column type override in order to properly
type cast computed columns included in a result set. This should never
override the known types of full fledged columns. In addition to messing
up computed properties, this would have led to inconsistent behavior
between a record created with `new`, and a record created with `last` on
the mysql adapter in the following cases:
- `tinyint(1)` with `emulate_booleans` set to `false`
- `text`, `string`, `binary`, and `decimal` columns
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