Fix ExtensionCodec example so it recurses.

[jcc10]

Fixes example so data doesn't get lost in recursion.

Creates valid workaround for #138

Spent about a hour before I realized the example was broken. 🤦‍♀️

[gfx]

Thank you! Yes, you are right, and I have also experienced the same issue before. It is a wrong design of the current interface, which I'd love to fix in the future.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (e615511) 98.58% compared to head (29a970f) 98.58%.

❗ Current head 29a970f differs from pull request most recent head 07900e5. Consider uploading reports for the commit 07900e5 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #225   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
=======================================
  Files          16       16           
  Lines         990      990           
  Branches      195      195           
=======================================
  Hits          976      976           
  Misses         14       14           

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