Compare readable stream content

[thewilkybarkid]

Currently resources are compared by their internal ID. For readable streams, it would be useful to compare their content. This tries to read (and reset) the resource, and compares the hashed results.

(Refs libero/content-api-bundle#5 (comment))

[codecov]

Codecov Report

Merging #65 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master      #65      +/-   ##
============================================
+ Coverage     99.07%   99.11%   +0.03%     
- Complexity      123      127       +4     
============================================
  Files            15       15              
  Lines           325      338      +13     
============================================
+ Hits            322      335      +13     
  Misses            3        3

Impacted Files	Coverage Δ	Complexity Δ
src/ResourceComparator.php	100% <100%> (ø)	8 <4> (+4)	⬆️

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