Add methods to resolve ambiguity with Base

[jishnub]

Added methods to // to resolve ambiguity involving Complex numbers and AbstractArrays. Also added a test to ensure that ambiguities do not creep in.

[codecov-commenter]

Codecov Report

Merging #9 into master will decrease coverage by 6.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
- Coverage   97.51%   91.46%   -6.06%     
==========================================
  Files           1        1              
  Lines         161      164       +3     
==========================================
- Hits          157      150       -7     
- Misses          4       14      +10     

Impacted Files	Coverage Δ
src/HalfIntegers.jl	91.46% <100.00%> (-6.06%)	⬇️

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[sostock]

Thanks for the PR!

The test failures on nightly are due to JuliaLang/julia#35483 and JuliaLang/julia#35492, which changed the return type of *(::Rational, ::Integer) and *(::Integer, ::Rational). I have opened an issue here: JuliaLang/julia#36277. If that isn’t resolved, I would be in favor of just relaxing the tests to not check for the return type.

[sostock]

Now that JuliaLang/julia#36279 is merged (and will be backported to 1.5), this should be good.