Avoid boxing when using positional logging parameters

[snakefoot]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 79.31034% with 6 lines in your changes missing coverage. Please review.

Project coverage is 78.64%. Comparing base (3555797) to head (c8687f3).

Files with missing lines	Patch %	Lines
src/NLog.Extensions.Logging/Logging/NLogLogger.cs	80.76%	2 Missing and 3 partials ⚠️
...nsions.Logging/Logging/NLogMessageParameterList.cs	66.66%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #787      +/-   ##
==========================================
+ Coverage   77.57%   78.64%   +1.06%     
==========================================
  Files          19       19              
  Lines        1958     1962       +4     
  Branches      374      375       +1     
==========================================
+ Hits         1519     1543      +24     
+ Misses        278      252      -26     
- Partials      161      167       +6     

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