Fix issues/1399

[btakita]

Store - Cyclical Dependency Detected when child computed property defined before parent & grand-parent computed proprety

[codecov-io]

Codecov Report

Merging #1400 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1400   +/-   ##
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  Coverage   91.25%   91.25%           
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  Files         122      122           
  Lines        4485     4485           
  Branches     1385     1385           
=======================================
  Hits         4093     4093           
  Misses        154      154           
  Partials      238      238

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[Rich-Harris]

Thanks @btakita. I'm not 100% sure the rootKey mechanism is correct — the error I get for the case where a and b depend on each other doesn't mention b, as key and rootKey are both a. I think it might need to be something more like #1405?

[btakita]

Sounds good to me :-)