Avoid space.wrap when possible

Merged Bitbucket Importer requested to merge bitbucket/merged-pr-518 into branch/default

Created originally on Bitbucket by fniephaus (Fabio Niephaus)

Was already merged in Bitbucket before import, marked as merged by the import user

space.wrap has been marked as @not_rpython in 7ce64de7ad35.

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