Address net8-preview changes

[viceroypenguin]

This PR fixes changes from the latest net8 preview compiler:

• a newly generated CA1859 warning;
• the expected exception thrown by CopyTo

[codecov]

Codecov Report

Patch coverage: 95.45% and project coverage change: +0.05% 🎉

Comparison is base (2f8e98a) 92.97% compared to head (c07b095) 93.02%.
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #491      +/-   ##
==========================================
+ Coverage   92.97%   93.02%   +0.05%     
==========================================
  Files         245      249       +4     
  Lines        8094     8182      +88     
  Branches     1617     1635      +18     
==========================================
+ Hits         7525     7611      +86     
+ Misses        359      357       -2     
- Partials      210      214       +4     

Files Changed	Coverage Δ
Source/SuperLinq/Permutations.cs	94.82% <ø> (ø)
Source/SuperLinq.Async/WhereLag.cs	91.66% <91.66%> (ø)
Source/SuperLinq.Async/WhereLead.cs	93.33% <93.33%> (ø)
Source/SuperLinq.Async/AsyncSuperEnumerable.cs	100.00% <100.00%> (ø)
Source/SuperLinq/WhereLag.cs	100.00% <100.00%> (ø)
Source/SuperLinq/WhereLead.cs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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