Use str() when migrating checkout_workflow_policy #136
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The schema-field is ASCIILine since 5.1b4.
I'm not sure if this would break migrations from a existing 5.0.8 to a future 5.0.9. But it fixes migrations from Plone 4 to 5.1 provided we do not merge revert to TextLine with plone/plone.app.iterate#53
Maybe the change of plone/plone.app.iterate@a3c1340 requires another upgrade-step that changes a existing unicode-value to ascii