Rework storage

[codecov[bot]]

Codecov Report

Merging #14 into master will increase coverage by 0.05%. The diff coverage is 94.32%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
+ Coverage   91.06%   91.12%   +0.05%     
==========================================
  Files          19       21       +2     
  Lines         571      642      +71     
==========================================
+ Hits          520      585      +65     
- Misses         35       42       +7     
+ Partials       16       15       -1     

Impacted Files	Coverage Δ
parameter_list.go	75.00% <ø> (ø)
provider_ctor.go	87.87% <66.66%> (-1.36%)	:arrow_down:
errors.go	93.33% <84.61%> (-6.67%)	:arrow_down:
cycle.go	93.10% <88.88%> (+1.10%)	:arrow_up:
inject.go	86.15% <91.66%> (-0.21%)	:arrow_down:
container.go	92.85% <92.30%> (-2.69%)	:arrow_down:
parameter.go	87.03% <94.59%> (+4.42%)	:arrow_up:
key.go	100.00% <100.00%> (ø)
provider.go	100.00% <100.00%> (ø)
provider_group.go	100.00% <100.00%> (ø)
... and 6 more

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[defval]

Related to #11.