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Using Composer to manage Drupal site dependencies
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Lots more functionality, flexibility, and testing.
#2323515: Allow Recipes to be referenced by full path
#2320973: Implement conflict part of spec
#2320979: Dependency management
#2320977: Add supported drupal cores to spec
#2321027: Add hooks, basically everywhere
#2307023: Support php / hook based recipe loading
#2299993: Allow recipes to be triggered automatically
#2326049: Allow for definitions in drushrc.php
The drush.recipes webservice has also been tested more and there is a validation function / new command that's been added so that you can validate your custom made recipes against!