Rule of thumb for when to use JLSO

[cossio]

Close #120 .

[codecov]

Codecov Report

Merging #121 (2716487) into master (ada8158) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #121      +/-   ##
==========================================
- Coverage   97.67%   97.65%   -0.03%     
==========================================
  Files           6        6              
  Lines         215      213       -2     
==========================================
- Hits          210      208       -2     
  Misses          5        5              

Impacted Files	Coverage Δ
src/metadata.jl	100.00% <0.00%> (ø)
src/serialization.jl	100.00% <0.00%> (ø)

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[cossio]

merge?

[rofinn]

Sorry, got distracted, but merging now. Thanks for the PR :)