Fix type converter handling when init return is annotated

[wyfo]

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[codecov-commenter]

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@@            Coverage Diff            @@
##             master     #327   +/-   ##
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  Coverage          ?   86.13%           
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  Files             ?       67           
  Lines             ?     5880           
  Branches          ?     1218           
=========================================
  Hits              ?     5065           
  Misses            ?      596           
  Partials          ?      219           

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