Fix type wrapper maybe uninitialized

[jxy-s]

Converts type wrapper of a reference to use a pointer. This resolves GCC maybe uninitialized problems. It also optimizes since (I believe) the construction on assignment was strictly unnecessary given the known reference type, a simple pointer assignment should suffice.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.84%. Comparing base (b478350) to head (79314b5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #32      +/-   ##
==========================================
+ Coverage   89.79%   89.84%   +0.05%     
==========================================
  Files          17       17              
  Lines        1989     1989              
  Branches      263      263              
==========================================
+ Hits         1786     1787       +1     
  Misses         13       13              
+ Partials      190      189       -1     

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