remove ambiguities

[jverzani]

Addresses ambiguities noted in #435

[codecov]

Codecov Report

Merging #436 (dde42a3) into master (089d03b) will decrease coverage by 0.09%.
The diff coverage is 30.76%.

@@            Coverage Diff             @@
##           master     #436      +/-   ##
==========================================
- Coverage   82.88%   82.79%   -0.10%     
==========================================
  Files          23       23              
  Lines        2881     2889       +8     
==========================================
+ Hits         2388     2392       +4     
- Misses        493      497       +4     

Impacted Files	Coverage Δ
src/common.jl	90.00% <0.00%> (-0.76%)	⬇️
src/polynomials/mutable-arithmetics.jl	92.85% <0.00%> (-7.15%)	⬇️
src/polynomials/standard-basis.jl	89.15% <0.00%> (ø)
src/rational-functions/common.jl	71.21% <0.00%> (-0.27%)	⬇️
src/polynomials/LaurentPolynomial.jl	94.94% <33.33%> (-1.08%)	⬇️
src/polynomials/ChebyshevT.jl	96.21% <100.00%> (+2.16%)	⬆️
src/polynomials/ImmutablePolynomial.jl	91.66% <100.00%> (ø)
src/polynomials/factored_polynomial.jl	85.31% <100.00%> (ø)

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