Fix Polynomial Gen

[LukaJCB]

Should address part of #756

[codecov-io]

Codecov Report

Merging #758 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #758      +/-   ##
==========================================
- Coverage   52.02%   52.01%   -0.01%     
==========================================
  Files         196      196              
  Lines       11904    11904              
  Branches     1649     1646       -3     
==========================================
- Hits         6193     6192       -1     
- Misses       5711     5712       +1

Impacted Files	Coverage Δ
laws/src/main/scala/spire/laws/gen.scala	74.73% <0%> (ø)	⬆️
core/src/main/scala/spire/math/Algebraic.scala	65.44% <0%> (-2.65%)	⬇️
extras/src/main/scala/spire/math/FixedPoint.scala	34.97% <0%> (-0.55%)	⬇️
core/src/main/scala/spire/math/Rational.scala	95.29% <0%> (ø)	⬆️
core/src/main/scala/spire/math/Interval.scala	68.89% <0%> (+0.51%)	⬆️
...ala/spire/math/poly/BigDecimalRootRefinement.scala	83.44% <0%> (+0.66%)	⬆️
...ore/src/main/scala/spire/math/interval/Bound.scala	54.33% <0%> (+7.87%)	⬆️

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[tixxit]

👍

[LukaJCB]

Anything I can do to get this merged? :)

[LukaJCB]

Thanks!