Restore fastify request/reply raw values after express runs.

[dlongley]

Addresses #65.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 96.15385% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.77%. Comparing base (65ce570) to head (7a78819).

Files with missing lines	Patch %	Lines
lib/index.js	96.15%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #66      +/-   ##
==========================================
+ Coverage   94.49%   94.77%   +0.28%     
==========================================
  Files           3        3              
  Lines         781      804      +23     
==========================================
+ Hits          738      762      +24     
+ Misses         43       42       -1     

Files with missing lines	Coverage Δ
lib/index.js	93.58% <96.15%> (+0.39%)	⬆️

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