fix(model): prevent _store from becoming a cyclic object value.

[cuebit]

Type of PR:

• Bugfix
• Feature
• Refactor
• Code style update
• Build-related changes
• Test
• Documentation
• Other, please describe:

Breaking changes:

• No
• Yes

Details

This PR resolves #10 where a fortuitous side-effect is caused by model's exposing the _store property.

[codecov]

Codecov Report

Merging #11 into master will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #11      +/-   ##
==========================================
+ Coverage   97.27%   97.32%   +0.05%     
==========================================
  Files          31       31              
  Lines         734      898     +164     
  Branches      105      136      +31     
==========================================
+ Hits          714      874     +160     
- Misses         19       24       +5     
+ Partials        1        0       -1     

Impacted Files	Coverage Δ
src/model/Model.ts	94.06% <100.00%> (+0.05%)	⬆️
src/repository/Repository.ts	100.00% <0.00%> (ø)
src/query/Query.ts	95.33% <0.00%> (+0.81%)	⬆️
src/support/Utils.ts	98.00% <0.00%> (+0.81%)	⬆️

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[kiaking]

Ahh very good point. Thanks so much for the fix!