improve inference in Ray

[jishnub]

After this, the following is type-inferred:

julia> @inferred Ray(0..Inf)
【0.0,∞❫

[codecov]

Codecov Report

Base: 60.58% // Head: 66.97% // Increases project coverage by +6.39% 🎉

Coverage data is based on head (db8c623) compared to base (0b7ecbb).
Patch coverage: 83.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   60.58%   66.97%   +6.39%     
==========================================
  Files          28       28              
  Lines        2471     2483      +12     
==========================================
+ Hits         1497     1663     +166     
+ Misses        974      820     -154     

Impacted Files	Coverage Δ
src/Domains/Ray.jl	78.46% <75.00%> (+34.60%)	⬆️
src/Spaces/IntervalSpace.jl	75.00% <100.00%> (+8.33%)	⬆️
...c/Spaces/Ultraspherical/UltrasphericalOperators.jl	80.00% <100.00%> (+0.22%)	⬆️
src/Spaces/PolynomialSpace.jl	88.80% <0.00%> (+0.39%)	⬆️
src/Spaces/Laguerre/Laguerre.jl	60.13% <0.00%> (+1.35%)	⬆️
src/Spaces/Chebyshev/Chebyshev.jl	59.57% <0.00%> (+1.41%)	⬆️
src/Spaces/Ultraspherical/Ultraspherical.jl	79.31% <0.00%> (+1.72%)	⬆️
src/Spaces/Jacobi/Jacobi.jl	64.35% <0.00%> (+1.98%)	⬆️
src/Spaces/Ultraspherical/ContinuousSpace.jl	54.28% <0.00%> (+3.03%)	⬆️
src/show.jl	55.88% <0.00%> (+8.82%)	⬆️
... and 10 more

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