cache the subsets of a collection when the other parts changes cause the collection reference change

[dingchaoyan1983]

There is one case, like below:

let arr = [a, b, c, d];

const selector = createSelector(
     arr => arr,
     (list) => list.filter((item) => item.type === 'a'));

const sub = selector({arr: arr});

we create a selector which is depend an array, and this selector will filter out the subset which type is a, but if the element of other type b has been changed, because the immutable, we will generate a new array, but the inner elements is the same as before except the changed one, so if we use the same selector it will output a new subset, but the inner element is same, so we want to use the cached subset at this time. we want to cut off the selectors change chain.

[coveralls]

Coverage remained the same at 100.0% when pulling d54607a on dingchaoyan1983:master into 1143dcb on reactjs:master.

[coveralls]

Coverage remained the same at 100.0% when pulling d54607a on dingchaoyan1983:master into 1143dcb on reactjs:master.

[codecov-io]

Codecov Report

Merging #217 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master   #217   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          12     14    +2     
=====================================
+ Hits           12     14    +2

Impacted Files	Coverage Δ
src/index.js	100% <100%> (ø)	✅

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[coveralls]

Coverage remained the same at 100.0% when pulling 28de07c on dingchaoyan1983:master into 1143dcb on reactjs:master.

[coveralls]

Coverage remained the same at 100.0% when pulling 69cfaab on dingchaoyan1983:master into 1143dcb on reactjs:master.

[markerikson]

Superseded by #513 .