Different access modes based on type

[bugadani]

A different approach to the relaxed collection. Instead of providing a key and an index interface that does the same, separate the two based on type. This builds on the idea that having the relaxed makes the key-based access redundant, and thus it does not provide those methods.

There's a slight problem with having an object id in relaxed mode, otherwise this is probably the least redundant way to provide a relaxed collection.

• Tests

[codecov-io]

Codecov Report

Merging #10 into master will increase coverage by 1.71%.
The diff coverage is 73.23%.

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
+ Coverage   64.46%   66.18%   +1.71%     
==========================================
  Files           2        2              
  Lines         197      207      +10     
  Branches       28       31       +3     
==========================================
+ Hits          127      137      +10     
+ Misses         32       28       -4     
- Partials       38       42       +4     

Flag	Coverage Δ
#unittests	66.18% <73.23%> (+1.71%)	⬆️

Impacted Files	Coverage Δ
src/lib.rs	60.86% <70.58%> (+3.98%)	⬆️
tests/test.rs	72.82% <80.00%> (-1.04%)	⬇️

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[bugadani]

Superseded by #17