Use isone

[blegat]

Needs JuliaAlgebra/StarAlgebras.jl#64

Requires

• Fix in for ExponentsIterator JuliaAlgebra/MultivariatePolynomials.jl#361
• Fix one JuliaAlgebra/MultivariateBases.jl#77

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.56%. Comparing base (b7f6576) to head (b935388).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #398      +/-   ##
==========================================
+ Coverage   84.53%   84.56%   +0.03%     
==========================================
  Files          41       41              
  Lines        2516     2521       +5     
==========================================
+ Hits         2127     2132       +5     
  Misses        389      389              

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