Define one(::Type{Measurement{T}}) to return one(T)

[giordano]

This will eventually fix #134, but there are lots of failures.

CC: @stevengj. I opened the PR for reference, but I don't really know what to do with all the failures.

[giordano]

Ok, all in all the problems here are inference issue of complex power and det (#134 (comment)), which I believe are bugs in Julia itself, not this package. In #134 I mentioned a spate of issues in QuadGK.jl, but those are unrelated to this PR and this package.

[codecov-commenter]

Codecov Report

Merging #135 (ea728cf) into master (4ffcdbf) will increase coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head ea728cf differs from pull request most recent head 02195b2. Consider uploading reports for the commit 02195b2 to get more accurate results

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
+ Coverage   95.44%   95.45%   +0.01%     
==========================================
  Files          13       12       -1     
  Lines         746      726      -20     
==========================================
- Hits          712      693      -19     
+ Misses         34       33       -1     

Impacted Files	Coverage Δ
src/Measurements.jl	86.66% <ø> (-0.44%)	⬇️
src/math.jl	97.93% <100.00%> (+0.01%)	⬆️

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[giordano]

I have no idea of why the benchmarks are broken, but this happens always whenever you touch anything related to the benchmarks. It's really cumbersome to use PkgBenchmark when you make any changes to the package, which kinda defeats the purpose of running it in PRs...