Use some unsave operators

[SoongNoonien]

With the test for 3D4.0 from #238 current master performs like this:

julia> @time scalar_test(g)
 71.137125 seconds (233.27 M allocations: 24.491 GiB, 12.05% gc time)

And this PR:

julia> @time scalar_test(g)
 66.839489 seconds (231.88 M allocations: 24.387 GiB, 11.68% gc time)

[SoongNoonien]

Ok, after getting the tests to work again the improvement has vanished...

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.21%. Comparing base (72c5311) to head (4b114e5).

Files with missing lines	Patch %	Lines
src/GenericCyclotomics.jl	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #244      +/-   ##
==========================================
- Coverage   95.93%   95.21%   -0.73%     
==========================================
  Files          12       12              
  Lines         837      836       -1     
==========================================
- Hits          803      796       -7     
- Misses         34       40       +6     

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