fix Optional typing hint for SerializerMethodField #428
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Hello,
As reported in #426, commit 69b628a broke type hinting for
SerializerMethodField
return values.Here is a fix`that reverts two lines that I believe should not have been removed, and adds a test to ensure it won't break again.
I only tested with 3.7 on my machine, I hope it doesn't break anything for other Python versions.