Reintroduce string_body

[ashtum]

No description provided.

[cppalliance-bot]

An automated preview of the documentation is available at https://154.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://154.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://154.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://154.http-proto.prtest.cppalliance.org/index.html

[cppalliance-bot]

An automated preview of the documentation is available at https://154.http-proto.prtest.cppalliance.org/index.html

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.88%. Comparing base (6eac235) to head (3cedee9).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #154      +/-   ##
===========================================
+ Coverage    92.77%   92.88%   +0.11%     
===========================================
  Files           80       80              
  Lines         4997     4950      -47     
===========================================
- Hits          4636     4598      -38     
+ Misses         361      352       -9     

Files with missing lines	Coverage Δ
src/field.cpp	93.97% <100.00%> (ø)
src/version.cpp	100.00% <ø> (ø)

... and 2 files with indirect coverage changes

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